As part of continued improvements to our network we are introducing some new IP addresses for SIP signalling traffic in London, Manchester, and Slough from 23rd August 2016
Please see our revised interop information and ensure that you allow SIP signalling to/from the new IPs and correctly identify these as a permitted source for inbound traffic in your own configuration before 23rd August 2016 to ensure no disruption to your service.
Due to the nature of this announcement, we have sent an eMail to all active customers detailing the changes.