IP Phones Falling to SRST after resuming from Hold

[sanoop.narayan1]

Hi all,

I am having 2 locations. My location A and B has 9951 ip phones installed. Loc A has the CUCM and Loc B is and SRST site. There is only one Node.  When I call from LocA 9951 to Loc B 9951 and I place hold on Loc B phone and receives another call, then I resumes the hold on Loc B ip phones, the Ip phones gets hanged and the phone goes to SRST mode. Sometime the whole site moves to SRST. I checked the connectivity and cannot find any issue on the connectivity.

Can any one give me any suggestion on this...?

Regards

Sanup

[Manish Gogna]

Hi Sanup,

If the issue is so easily reproducible then to understand what is causing the issue you need to get detailed callmanager service trace from CUCM as well as packet capture from the IP phone that resets. This will provide details of the SIP signaling as well as keepalive/ack details to establish if it is a network issue or something else.

Also, share the cucm version and phone firmware details. Also, if you try such a call between two 9951's on the same site as CUCM then also do you face the same issue? if yes, then it could be something on cucm/phone side, else it is most likely a network issue.

Manish

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