SIP anonymous

Unanswered Question
Oct 8th, 2008


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

Max-Forwards: 31

Reason: q.850;cause=127

To: <sip:[email protected];user=phone>;tag=5C7282A8-1126

User-Agent: Cirpack/v4.41f (gw_sip)

Via: SIP/2.0/UDP;branch=z9hG4bK-5D04-16543F

Content-Length: 0

Does anyobody have any idea why such a call would be established successfully and then fail as soon as called party answers?



I have this problem too.
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