i came across the following problem:
When a caller is calling a local ip phone over SIP trunk and is hiding his number (marked private) the call is established, but as soon as the handset is picked up, the call fails.
The setup is as follows:
SIP provider -> Firewall -> Session Border Controller -> Call Manager
There is the BYE message that is sent:
BYE sip:[email protected] SIP/2.0
Call-ID: mailto:[email protected]
CSeq: 7451980 BYE
From: "Anonymous" <sip:[email protected]>;tag=30271-DF-0074cae1-261fd9ba3
To: <sip:[email protected];user=phone>;tag=5C7282A8-1126
User-Agent: Cirpack/v4.41f (gw_sip)
Via: SIP/2.0/UDP 10.217.2.1:34677;branch=z9hG4bK-5D04-16543F
Does anyobody have any idea why such a call would be established successfully and then fail as soon as called party answers?