Start: Tuesday 24 November 2026, 21:00 (UK) End: Wednesday 25 November 2026, 01:00 (UK)
Affected services: Legacy SIP platform (SIP-CL2) customers in the first migration group; SIP Connect
Details: We will be moving the first group of customers from our legacy SIP platform (SIP-CL2) to SIP Connect, our newer high-availability platform. This is the first of several migration windows; all SIP-CL2 customers will be moved in groups over the coming weeks.
Action required before your migration:
3CX customers: No action is required. Your 3CX system is already configured to move over automatically.
All other phone systems: Please make sure your phone system is configured to use our DNS service (SRV) record:
sip-gw2.it-communicationsltd.co.uk
When we migrate your account, we will update this record and your phone system will move over to SIP Connect automatically.
If your phone system is configured with either of the following static hostnames or IP addresses, please change it to sip-gw2.it-communicationsltd.co.uk before the migration date: 24 November 2026,
Phone systems left on these static hostnames or IP addresses will NOT move over automatically and will stop working when SIP-CL2 is retired.
Your SIP username, password and phone numbers do not change.
Expected impact: - Customers in this group may experience a brief interruption while their phone systems re-register to the new platform. - Other customers are not expected to be affected.
Retirement of SIP-CL2: Once all customers have been migrated, the SIP-CL2 platform will be retired and the hostnames and IP addresses above will no longer accept calls or registrations.
If you experience any issues after the window, or need help checking your phone system's configuration, please contact our support team quoting "Maintenance 24 November".
If your firewall restricts which addresses can reach your phone system, please allow 185.131.10.0/24 and replace any previous allow lists for 185.131.10.X
Posted Nov 11, 2026 - 14:21 GMT
This scheduled maintenance affects: SIP Trunk Cluster CL2 (SIP Trunking - sip-cl2-01-sov.as203416.net, SIP Trunking - sip-cl2-02-vta.as203416.net) and VoIP Calls (SIP Connect).