Scenario#46 – 9951 SIP phones drop call after 18 seconds

Posted: July 17, 2014 in Uncategorized

Recently I came across an issue with a new customer deployment where the 9951 SIP phones would drop call after 18s. All other SCCP phones were working fine but only these SIP phones would drop the call.


Call flow:

9951 -> SIP -> CUCM -> SIP -> CUBE

Bind commands were in place and the only way I could resolve the issue was forcing RTCP parameter “disabled” under Common phone profile and Enterprise Phone parameters.

System -> Enterprise Phone Configuration


Device -> Device Settings -> Common Phone Profile


  1. Frank says:

    Did you stop updating the website? Your tips are very helpful!

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