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Simplifying Registered SIP Trunk Configurations

Clearfly is pleased to announce a service change aimed at making the installation and configuration of registered SIP trunks faster and easier for our customers and partners. These changes effectively eliminate the requirement that Clearfly customers with registered SIP trunks add a P-Asserted-Identity (PAI) header to their SIP signaling when sending a calling number that they don’t own. This header was necessary so that our switch could properly associate the call with the customer’s trunk. Now, however, Clearfly will strip any PAI that the customer sends to us and will assert our own PAI header based upon the source IP address of the customer’s signaling.

In addition to simplifying the configuration for existing registered SIP trunking customers, this change will open up a new world of possibilities for customers with existing static SIP trunks, many of whom have been prevented from utilizing registered SIP trunks due to an inability to properly insert PAI headers into their signaling — an especially common problem for those wishing to forward or transfer calls from their system while preserving the original calling number. Registered trunks will eliminate the requirement for these customers to maintain a static IP address, and all registered trunk customers will be able to send any valid calling number they’d like with no additional configuration requirements.

This new feature is now the default for all new and existing registered SIP trunks. Some customers with uncommon configuration requirements, such as those with multiple SIP trunks from the same phone system, will still be required to insert a PAI header into their signaling. For these special cases, Clearfly has enabled the ability for customers to change their realm configuration in real-time via the Clearfly Portal. See Clearfly’s FAQ for more details.

If you’d like more information about the different ways you can connect to Clearfly for voice service, an in-depth discussion of different configuration and signaling options is available in our Knowledge Base.

Ken Mix - December 31, 2015