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Support for Diversion Header in Cisco Emergency Responder

I'm troubleshooting an issue where it appears as though CER is sending an invalid Diversion Header to the AT&T SIP Trunking service.  Having reviewed the trace I see the following:

The Request line (from the trace) looks fine--we can clearly see that the customer is attempting to call 911. But it looks as though whatever CER is doing to the Diversion header (populating it with 911 or 9911) is not an acceptable format for AT&T. 

Diversion: 9911


From:   901XXXXXXX

TAC advised the customer to configure a command under the sip-profiles in CUBE to either strip or ignore Diversion Header.  The customer reported success with this approach.  TAC also advised the customer that the CER was properly configured—thus it appears that the CER’s default behavior is to populate the Diversion Header with a format that the AT&T can’t support.


Is there a configuration within CER which will populate the Diversion Header with a 10 digit TN such as how it appears in the PAI?



  • IP Telephony
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