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Cisco Bug: CSCta16946 - incorrect SIP URI - @ sign is present when user field is empty

Last Modified

Feb 21, 2018

Products (1)

  • Cisco 2800 Series Integrated Services Routers

Known Affected Releases

12.4(22)T1

Description (partial)

Symptom:
When an ISDN SETUP message is sent without Calling Line Identity to the ISR, the ISR inserts the following PAID in the SIP INVITE:
P-Asserted-Identity: <sip:@203.202.104.145>
This is an incorrect SIP URI: the user field is empty and the @ sign is incorrectly included.
Third party device does not accept this as valid SIP syntax and rejects the call. They would expect the following PAID:
P-Asserted-Identity: <sip:203.202.104.145>

Conditions:
The ISR sends:
P-Asserted-Identity: <sip:@203.202.104.145> 
We then receive:
SIP/2.0 400 Invalid P-Asserted-Identity

Note: If they configure a default CLI under the pots dialpeer then the call works, or if the ISDN SETUP has CLI the call works.
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