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SIP anonymous

Hi,

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:012418616@10.217.2.2 SIP/2.0

Call-ID: mailto:30271-WS-0074cae0-393550b04@sip-priv.amis.net

CSeq: 7451980 BYE

From: "Anonymous" <sip:anonymous@anonymous.invalid>;tag=30271-DF-0074cae1-261fd9ba3

Max-Forwards: 31

Reason: q.850;cause=127

To: <sip:012418616@10.70.1.3;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

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?

Regards,

Marko

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