THIS IS A SCHEDULED EVENT Nov <var data-var='date'>19</var>, <var data-var='time'>05:00</var> - <var data-var='time'>11:00</var> UTC Oct <var data-var='date'> 1</var>, <var data-var='time'>03:17</var> UTC Scheduled - An external supplier has scheduled a maintenance. Impact SMS: Clients may experience delayed or failed 10DLC MT/MO traffic towards the United States and Canada. Impact MMS: Clients may experience delayed or failed 10DLC MT/MO traffic towards the United States. Maintenance Start Time: 2026-11-19 05:00 UTC Maintenance End Time: 2026-11-19 11:00 UTC

External Maintenance - US and Canada

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>29</var>, <var data-var='time'>03:00</var> - <var data-var='time'>07:00</var> UTC Sep <var data-var='date'> 4</var>, <var data-var='time'>08:53</var> UTC Scheduled - An external supplier has scheduled a maintenance. Impact SMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States and Canada. Impact MMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States. Maintenance Start Time: 2026-10-29 03:00 UTC Maintenance End Time: 2026-10-29 07:00 UTC

External Maintenance - United States and Canada

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>22</var>, <var data-var='time'>03:00</var> - <var data-var='time'>07:00</var> UTC Sep <var data-var='date'> 4</var>, <var data-var='time'>08:49</var> UTC Scheduled - An external supplier has scheduled a maintenance. Impact SMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States and Canada. Impact MMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States. Maintenance Start Time: 2026-10-22 03:00 UTC Maintenance End Time: 2026-10-22 07:00 UTC

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>20</var>, <var data-var='time'>07:00</var> - <var data-var='time'>10:00</var> UTC Oct <var data-var='date'> 6</var>, <var data-var='time'>10:55</var> UTC Scheduled - Sinch will be performing a scheduled maintenance to renew the SSL certificate's. Type: Scheduled Maintenance Maintenance: SSL Certificate Updates Start Time: 2026-10-20 07:00 UTC End Time: 2026-10-20 10:00 UTC Impact: sms.api.sinch.com, us.sms.api.sinch.com, eu1.api.sinch.com We appreciate your patience and apologize for any inconvenience experienced during this maintenance period. If for any reason the maintenance is extended or cancelled we will advise you accordingly. As part of this update, please note that the root certificates have also changed. We recommend updating the root certificates as well to ensure continued trust and smooth operation. Download the certificate files for all the above mentioned certificates here:https://clxgroup.sharepoint.com/:f:/s/CLX_Support_Anonymous_link/IgALRDsM8tADTai40OEYnKelASGNnSO-pEEyNQaCDUec0pQ

Sinch Maintenance - SSL Certificate Renewal

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>18</var>, <var data-var='time'>01:00</var> UTC &nbsp;-&nbsp; Oct <var data-var='date'>19</var>, <var data-var='time'>07:00</var> UTC Oct <var data-var='date'> 6</var>, <var data-var='time'>09:13</var> UTC Scheduled - Dear Customer, We will be performing Contact Pro maintenance and version upgrade as follows. Start time: 2026-10-18 (Sunday) 1 AM UTC End time: 2026-10-19 (Monday) 7 AM UTC Version upgrade will require max. 30 minutes downtime to all channels and user interfaces. This will take place at some point during the maintenace window. What´s new documentation regarding the upcoming 26Q4 release can be accessed from: https://docs.cc.sinch.com/cloud/whats-new/en/index.html For more details or questions related to the maintenance you can contact us via a support ticket: https://sinchenterprise.atlassian.net/servicedesk/customer/portal/1181 Best Regards, Sinch Contact Pro team

Sinch Contact Pro Quarterly Maintenance - Americas

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>17</var>, <var data-var='time'>16:00</var> UTC &nbsp;-&nbsp; Oct <var data-var='date'>18</var>, <var data-var='time'>22:00</var> UTC Oct <var data-var='date'> 6</var>, <var data-var='time'>09:12</var> UTC Scheduled - Dear Customer, We will be performing Contact Pro version upgrade as follows. Start time: 2026-10-17 (Saturday) 4 PM UTC End time: 2026-10-18 (Sunday) 10 PM UTC Version upgrade will require max. 30 minutes downtime to all channels and user interfaces. This will take place at some point during the maintenace window. What´s new documentation regarding the upcoming 26Q4 release can be accessed from: https://docs.cc.sinch.com/cloud/whats-new/en/index.html For more details or questions related to the maintenance you can contact us via a support ticket: https://sinchenterprise.atlassian.net/servicedesk/customer/portal/1181 Best Regards, Sinch Contact Pro team

Sinch Contact Pro Quarterly Maintenance - EU

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>17</var>, <var data-var='time'>16:00</var> UTC &nbsp;-&nbsp; Oct <var data-var='date'>18</var>, <var data-var='time'>22:00</var> UTC Oct <var data-var='date'> 6</var>, <var data-var='time'>09:11</var> UTC Scheduled - Dear Customer, We will be performing Contact Pro version upgrade as follows. Start time: 2026-10-17 (Saturday) 4 PM UTC End time: 2026-10-18 (Sunday) 10 PM UTC Version upgrade will require max. 30 minutes downtime to all channels and user interfaces. This will take place at some point during the maintenace window. What´s new documentation regarding the upcoming 26Q4 release can be accessed from: https://docs.cc.sinch.com/cloud/whats-new/en/index.html For more details or questions related to the maintenance you can contact us via a support ticket: https://sinchenterprise.atlassian.net/servicedesk/customer/portal/1181 Best Regards, Sinch Contact Pro team

Sinch Contact Pro Quarterly Maintenance - AF

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>17</var>, <var data-var='time'>10:00</var> UTC &nbsp;-&nbsp; Oct <var data-var='date'>18</var>, <var data-var='time'>16:00</var> UTC Oct <var data-var='date'> 6</var>, <var data-var='time'>09:12</var> UTC Scheduled - Dear Customer, We will be performing Contact Pro version upgrade as follows. Start time: 2026-10-17 (Saturday) 10 AM UTC End time: 2026-10-18 (Sunday) 4 PM UTC Version upgrade will require max. 30 minutes downtime to all channels and user interfaces. This will take place at some point during the maintenace window. What´s new documentation regarding the upcoming 26Q4 release can be accessed from: https://docs.cc.sinch.com/cloud/whats-new/en/index.html For more details or questions related to the maintenance you can contact us via a support ticket: https://sinchenterprise.atlassian.net/servicedesk/customer/portal/1181 Best Regards, Sinch Contact Pro team

Sinch Contact Pro Quarterly Maintenance - AU

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>15</var>, <var data-var='time'>11:00</var> - <var data-var='time'>12:00</var> UTC Oct <var data-var='date'> 1</var>, <var data-var='time'>12:38</var> UTC Update - We will be undergoing scheduled maintenance during this time. Oct <var data-var='date'> 1</var>, <var data-var='time'>12:32</var> UTC Scheduled - We are writing to inform you that, as part of our continuous efforts to improve the performance, stability, and reliability of our platform, we will be performing scheduled maintenance on the XMS Traffic platform at the times specified below. Type: Maintenance – XMS Infra updates Start Time: 2026-10-15 11:00 UTC End Time: 2026-10-15 12:00 UTC Impact: XMS Traffic – AU During the maintenance window, clients making GET requests may experience intermittent service interruptions, increased response times, or temporary request failures due to the infra update activities. We appreciate your patience and apologize for any inconvenience experienced during this maintenance period. If for any reason the maintenance is extended or cancelled, we will advise you accordingly. Please contact support@sinch.com should you require further information or assistance.

Planned Maintenance - XMS AU Infrastructure Update

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>15</var>, <var data-var='time'>07:00</var> - <var data-var='time'>08:00</var> UTC Oct <var data-var='date'> 1</var>, <var data-var='time'>12:47</var> UTC Scheduled - We are writing to inform you that, as part of our continuous efforts to improve the performance, stability, and reliability of our platform, we will be performing scheduled maintenance on the XMS Traffic platform at the times specified below. Type: Maintenance – XMS Infra updates Start Time: 2026-10-15 07:00 UTC End Time: 2026-10-15 08:00 UTC Impact: XMS Traffic – BR, CA During the maintenance window, clients making GET requests may experience intermittent service interruptions, increased response times, or temporary request failures due to the infra update activities. We appreciate your patience and apologize for any inconvenience experienced during this maintenance period. If for any reason the maintenance is extended or cancelled, we will advise you accordingly. Please contact support@sinch.com should you require further information or assistance.

Planned Maintenance - XMS BR and CA Infrastructure Update

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>15</var>, <var data-var='time'>07:00</var> - <var data-var='time'>08:00</var> UTC Sep <var data-var='date'>24</var>, <var data-var='time'>17:58</var> UTC Update - We are writing to inform you that the concerned maintenance activity has been postponed to the below mentioned timeframe. Type: Service Announcement & Maintenance Previous Start Time: 2026-10-01 07:00 UTC Previous End Time: 2026-10-01 08:00 UTC New Start Time: 2026-10-15 07:00 UTC New End Time: 2026-10-15 08:00 UTC As part of our commitment to platform reliability, security, and scalability, Sinch is adding a brand-new, high-efficiency site to our core SMSC billing and messaging routing engine product. This site expansion introduces a next-generation, high-performance architecture to significantly increase our regional capacity, improve overall platform stability, and ensure robust message processing. New Regional Connection Endpoints that are planned to go live 2026-10-15 during the aforementioned time window. US SMPP: us6.smpp.api.sinch.com: US HTTP SMS: us6.httpsms.api.sinch.com US Lookup API: us6.httplookup.api.sinch.com Action Required: Firewall Whitelisting To ensure uninterrupted message delivery as we scale our traffic to include this new site we request that you update your firewall settings. Affected API Endpoint: (This change only affects customers connecting to either of the following US endpoints) US SMPP: us1.smpp.api.sinch.com and/or us7.smpp.api.sinch.com US HTTP SMS: us1.httpsms.api.sinch.com and/or us7.httpsms.api.sinch.com US Lookup API: us1.httplookup.api.sinch.com and/or us7.httplookup.api.sinch.com IP Addresses to Whitelist Please coordinate with your network security team to whitelist these target IP addresses: 35.95.194.74 44.239.11.143 52.32.122.205 If for any reason the maintenance is extended, cancelled, or postponed, we will advise you accordingly. Please contact support@sinch.com should you require further information or assistance. Jul <var data-var='date'>10</var>, <var data-var='time'>08:37</var> UTC Scheduled - As part of our commitment to platform reliability, security, and scalability, Sinch is adding a brand-new, high-efficiency site to our core SMSC billing and messaging routing engine product. This site expansion introduces a next-generation, high-performance architecture to significantly increase our regional capacity, improve overall platform stability, and ensure robust message processing. New Regional Connection Endpoints that are planned to go live 2026-10-01 during the target window: US SMPP: us6.smpp.api.sinch.com: US HTTP SMS: us6.httpsms.api.sinch.com US Lookup API: us6.httplookup.api.sinch.com Type: Service Announcement & Maintenance Maintenance start time: 2026-10-01 07:00 UTC Maintenance end time: 2026-10-01 08:00 UTC Action Required: Firewall Whitelisting To ensure uninterrupted message delivery as we scale our traffic to include this new site we request that you update your firewall settings. Affected API Endpoint: (This change only affects customers connecting to either of the following US endpoints) US SMPP: us1.smpp.api.sinch.com and/or us7.smpp.api.sinch.com US HTTP SMS: us1.httpsms.api.sinch.com and/or us7.httpsms.api.sinch.com US Lookup API: us1.httplookup.api.sinch.com and/or us7.httplookup.api.sinch.com IP Addresses to Whitelist Please coordinate with your network security team to whitelist these target IP addresses: 35.95.194.74 44.239.11.143 52.32.122.205 If for any reason the maintenance is extended, cancelled, or postponed, we will advise you accordingly. Please contact support@sinch.com should you require further information or assistance.

Service Announcement & Maintenance: New SMSC Site & Whitelisting Requirements - US Region

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>15</var>, <var data-var='time'>04:00</var> - <var data-var='time'>06:00</var> UTC Oct <var data-var='date'> 1</var>, <var data-var='time'>16:30</var> UTC Update - We are writing to inform you that the concerned maintenance activity has been postponed to the below mentioned timeframe. Type: Network Maintenance Affected Site: EU Previous Start Time: 2026-10-06 04:00 UTC Previous End Time: 2026-10-06 06:00 UTC New Start Time: 2026-10-15 04:00 UTC New End Time: 2026-10-15 06:00 UTC Impact: No expected impact. If for any reason the maintenance is extended or cancelled we will advise you accordingly. Please contact support@sinch.com should you require further information or assistance. Sep <var data-var='date'>22</var>, <var data-var='time'>15:58</var> UTC Scheduled - We are reaching out to inform you that a maintenance will be performed on our EU network infrastructure during the scheduled time window below. Type: Network Maintenance Affected Site: EU Maintenance Start Time: 2026-10-06 04:00 UTC Maintenance End Time: 2026-10-06 06:00 UTC Impact: No expected impact. If for any reason the maintenance is extended or cancelled we will advise you accordingly. Please contact support@sinch.com should you require further information or assistance.

Sinch Internal Maintenance - EU Network Infrastructure

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>15</var>, <var data-var='time'>04:00</var> - <var data-var='time'>10:00</var> UTC Sep <var data-var='date'> 4</var>, <var data-var='time'>17:20</var> UTC Scheduled - An external supplier has scheduled a maintenance. Impact SMS: Clients may experience delayed or failed 10DLC MT/MO traffic towards the United States and Canada. Impact MMS: Clients may experience delayed or failed 10DLC MT/MO traffic towards the United States. Maintenance Start Time: 2026-10-15 04:00 UTC Maintenance End Time: 2026-10-15 10:00 UTC

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>15</var>, <var data-var='time'>03:00</var> - <var data-var='time'>07:00</var> UTC Sep <var data-var='date'> 4</var>, <var data-var='time'>08:44</var> UTC Scheduled - An external supplier has scheduled a maintenance. Impact SMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States and Canada. Impact MMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States. Maintenance Start Time: 2026-10-15 03:00 UTC Maintenance End Time: 2026-10-15 07:00 UTC

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>14</var>, <var data-var='time'>06:00</var> - <var data-var='time'>16:00</var> UTC Sep <var data-var='date'>22</var>, <var data-var='time'>18:39</var> UTC Scheduled - We'll be performing scheduled maintenance on our Chatlayer platform infrastructure to improve resource management and monitoring capabilities. No service impact is expected during this maintenance. Maintenance windows per region (UTC): EMEA: 06:00 – 07:00 Americas (US): 08:00 – 09:00 Americas (South America): 09:00 – 10:00 APAC (India): 15:00 – 16:00 Chatlayer is expected to remain fully operational throughout. We will update this page if anything changes.

Sinch Internal Maintenance – Chatlayer Platform

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>14</var>, <var data-var='time'>03:00</var> - <var data-var='time'>10:00</var> UTC Sep <var data-var='date'>21</var>, <var data-var='time'>19:45</var> UTC Scheduled - An external supplier has scheduled a maintenance. Impact SMS: Clients may experience delayed or failed 10DLC MT/MO traffic towards the United States and Canada. Impact MMS: Clients may experience delayed or failed 10DLC MT/MO traffic towards the United States. Maintenance Start Time: 2026-10-14 03:00 UTC Maintenance End Time: 2026-10-14 10:00 UTC

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>13</var>, <var data-var='time'>04:00</var> - <var data-var='time'>10:00</var> UTC Sep <var data-var='date'> 4</var>, <var data-var='time'>17:32</var> UTC Scheduled - An external supplier has scheduled a maintenance. Impact SMS: Clients may experience delayed or failed 10DLC MT/MO traffic towards the United States and Canada. Impact MMS: Clients may experience delayed or failed 10DLC MT/MO traffic towards the United States. Maintenance Start Time: 2026-10-13 04:00 UTC Maintenance End Time: 2026-10-13 10:00 UTC

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>13</var>, <var data-var='time'>03:00</var> - <var data-var='time'>10:00</var> UTC Sep <var data-var='date'>18</var>, <var data-var='time'>21:49</var> UTC Scheduled - An external supplier has scheduled a maintenance. Impact SMS: Clients may experience delayed or failed 10DLC MT/MO traffic towards the United States and Canada. Impact MMS: Clients may experience delayed or failed 10DLC MT/MO traffic towards the United States. Maintenance start time: 2026-10-13 03:00 UTC Maintenance end time: 2026-10-13 10:00 UTC

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>8</var>, <var data-var='time'>04:00</var> - <var data-var='time'>10:00</var> UTC Sep <var data-var='date'> 4</var>, <var data-var='time'>16:37</var> UTC Scheduled - An external supplier has scheduled a maintenance. Impact SMS: Clients may experience delayed or failed 10DLC MT/MO traffic towards the United States and Canada. Impact MMS: Clients may experience delayed or failed 10DLC MT/MO traffic towards the United States. Maintenance Start Time: 2026-10-08 04:00 UTC Maintenance End Time: 2026-10-08 10:00 UTC

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>8</var>, <var data-var='time'>03:00</var> - <var data-var='time'>12:00</var> UTC Oct <var data-var='date'> 6</var>, <var data-var='time'>09:09</var> UTC Scheduled - Our 10DLC Provider has scheduled a maintenance. Impact: Delayed MT's/Delayed MO's/Missing delivery receipts/Late delivery receipts Maintenance start time: 2026-10-08 03:00 UTC Maintenance end time: 2026-10-08 12:00 UTC

External Maintenance - United States - 10DLC Provider

THIS IS A SCHEDULED EVENT Oct <var data-var='date'>8</var>, <var data-var='time'>03:00</var> - <var data-var='time'>07:00</var> UTC Sep <var data-var='date'> 4</var>, <var data-var='time'>08:38</var> UTC Scheduled - An external supplier has scheduled a maintenance. Impact SMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States and Canada. Impact MMS: Clients may experience delayed or failed Toll Free MT/MO traffic towards the United States. Maintenance Start Time: 2026-10-08 03:00 UTC Maintenance End Time: 2026-10-08 07:00 UTC

Oct <var data-var='date'> 6</var>, <var data-var='time'>15:10</var> UTC Completed - Dear Client, We are writing to inform you that the previously scheduled maintenance has been cancelled. Original Start Time: 2026-10-07 07:00 UTC Original End Time: 2026-10-07 13:00 UTC A new notice will be sent when this maintenance is rescheduled. If you have any questions, please contact support@sinch.com. Oct <var data-var='date'> 2</var>, <var data-var='time'>20:21</var> UTC Scheduled - In our continuous efforts to ensure high capacity and service quality, Sinch is adding another backend service for our legacy API’s. Maintenance Start Time: 2026-10-07 07:00 UTC Maintenance End Time: 2026-10-07 13:00 UTC Impact: Some customers may experience delay in MT traffic.

Emergency Maintenance - Legacy API Service Enhancement

Oct <var data-var='date'> 6</var>, <var data-var='time'>14:41</var> UTC Resolved - This incident has been resolved. Incident Start Time: 2026-10-06 13:41 UTC Incident End Time: 2026-10-06 14:08 UTC Oct <var data-var='date'> 6</var>, <var data-var='time'>13:58</var> UTC Investigating - We are currently observing delivery issues in French Guiana - Digicel Incident Start Time: 2026-10-06 13:41 UTC Impact: Delayed MT's/Delayed MO's/Missing delivery receipts/Late delivery receipts We will update as soon as we have more information. If you have any questions, please contact support@sinch.com.

Delivery Issue French Guiana - Digicel

Oct <var data-var='date'> 6</var>, <var data-var='time'>10:01</var> UTC Completed - The scheduled maintenance has been completed. Oct <var data-var='date'> 6</var>, <var data-var='time'>06:00</var> UTC In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Sep <var data-var='date'>30</var>, <var data-var='time'>20:26</var> UTC Scheduled - Services: DI SMS 365 (SMSX) PCR Number: PCRSDI-12365 Start Date and Time (GMT) :: 6th October 2026 6:00 Hrs. End Date and Time (GMT) :: 6th October 2026 10:00 Hrs. Impact Mobile Terminating (MT) Traffic: No impact expected. Mobile Originated (MO) Traffic: No impact expected. NRS Lookup: Potential latency for NRS Lookups Description: Sinch Digital Interconnect has scheduled a planned maintenance to carry out activities on the internal applications; no impact is expected during this activity. If you experience any issues during this maintenance, please contact the Operator Service NOC immediately at operatorservices.noc@sinch.com or +1 470.300.8394 (select ‘Support’ from the menu, option 2 for Digital Interconnect and then option 1) and reference this notification.

DI SMS 365 (SMSX) | Operator Services | Application Maintenance | PCR Number #PCRSDI-12365

Oct <var data-var='date'> 6</var>, <var data-var='time'>10:00</var> UTC Completed - The scheduled maintenance has been completed. Oct <var data-var='date'> 6</var>, <var data-var='time'>04:00</var> UTC In progress - Scheduled maintenance is currently in progress. We will provide updates as necessary. Sep <var data-var='date'> 4</var>, <var data-var='time'>16:04</var> UTC Scheduled - An external supplier has scheduled a maintenance. Impact SMS: Clients may experience delayed or failed 10DLC MT/MO traffic towards the United States and Canada. Impact MMS: Clients may experience delayed or failed 10DLC MT/MO traffic towards the United States. Maintenance Start Time: 2026-10-06 04:00 UTC Maintenance End Time: 2026-10-06 10:00 UTC

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Lastest published events

Emergency Maintenance - Legacy API Service Enhancement

Delivery Issue French Guiana - Digicel

DI SMS 365 (SMSX) | Operator Services | Application Maintenance | PCR Number #PCRSDI-12365

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Recent Sinch events

External Maintenance - US and Canada

External Maintenance - United States and Canada

External Maintenance - United States and Canada

Sinch Maintenance - SSL Certificate Renewal

Sinch Contact Pro Quarterly Maintenance - Americas

Sinch Contact Pro Quarterly Maintenance - EU