one way audio in the middle of the call

[soloo2014]

first Thank you all for this great forum , i have learned a lot from you guys.

i have an issue between one of my sites and the head office,

ip phone to ip phone (all SIP) calls is changing to one way in the middle .

Scenario:

Phone A at head office having a call with Phone B at the branch.

 randomly after ( 7 seconds to 2 minutes ) phone A stops hearing phone B but phone B keep hearing phone A

i have attached the stats of both phones during one of the calls,

i see that the phone at head office is getting some (Rcvr Lost Packets) while the phone B has none.

could this be an issue in the link between the two sites ? because i have another link to another site and no issue happening there.

Thanks in advance

[mohamed helmy]

Hi Soloo,

As you figured out, I believe it is all about routing issue and dropped packets.

just to make sure, try to capture the voice traffic with WireShark from the machine attached to the phone A at Head office. and you will find no voice packets during the one way audio interval.

please make sure that you enabled <<Span to PC Port>> option at the CUCM IP Phone configuration.

Regards,

Mohamed Helmy