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

Last Modified

Jan 31, 2017

Products (1)

  • Cisco 2800 Series Integrated Services Routers

Known Affected Releases


Description (partial)

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:@>
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:>

The ISR sends:
P-Asserted-Identity: <sip:@> 
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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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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