RTP payload - all FFFFFFFF`s

Unanswered Question
Feb 13th, 2009


I have one-way-voice issues on some calls, originating on two different gtw`s (both MGCP, E1)!

Let say, one of ten calls experience this problem - call is one-way-voice - from ip phone to gtw ok, but from gtw to ip phone there is only silence! when call is retryed everything is ok!

Interesting is that rtp payload in packets from gtw to phone consist of all FFFFF`s, and there is no lost of packets!

Here is wireshark capture, is IP of a gateway. Can somebody help please?


I have this problem too.
1 vote
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
darijohorvat Mon, 07/22/2013 - 01:25


It was resolved by contacting provider.

They had problem on some circuits, but I never received detailed description. For me, it was enough that problem have gone away

network.operati... Mon, 07/22/2013 - 02:12

THank you. Who was the provider? Device vendor or Network/Link service provider.

Cisco or any ISP.




This Discussion