IPA#
The IPA offers XPhone Connect as a cloud solution as ITSP. This provides a standard SIP trunk for the XCC.
First, set up an account in the IPA Partner Portal:

Hint
The XCC and the SIP gateways are to be set up as follows:
This facility takes over the IPA for the client systems.
Special configuration#
When setting up the XPhone Call Controller, the FQDN of the SBCs must be used:

The following entries are to be made in the advanced settings:
