4 Replies Latest reply on Jul 31, 2013 12:55 PM by jjeffries

    one way audio on calls to a 908e doing SIP -> PRI... 908 ICMP-rejects RTP?

    jjeffries New Member

      Getting one way voice on calls from SIP -> 908e PRI. Calls out from the PRI -> SIP work fine.

       

      SDP sets up the call normally, but then RTP packets to the agreed-upon port are not accepted by the 908, check it out:

       

       

      SDP from switch:
              v=0
              o=- 897409120 897409120 IN IP4 x.y.52.23
              s=-
              c=IN IP4 x.y.52.23
              t=0 0
              m=audio 33530 RTP/AVP 18 0 101
              a=rtpmap:101 telephone-event/8000
              a=ptime:20

       

       

       

      SDP 908:
              v=0
              o=- 1375286943 2 IN IP4 10.3.64.72
              s=-
              c=IN IP4 10.3.64.72
              t=0 0
              m=audio 10006 RTP/AVP 0 101
              a=rtpmap:0 PCMU/8000
              a=silenceSupp:off - - - -
              a=rtpmap:101 telephone-event/8000
              a=fmtp:101 0-15

       


      12:08:38.129635 IP (tos 0xb8, ttl 63, id 26129, offset 0, flags [none], proto UDP (17), length 200)
          x.y.52.23.33530 > 10.3.64.72.10006: UDP, length 172
      12:08:38.130794 IP (tos 0x0, ttl 255, id 1888, offset 0, flags [none], proto ICMP (1), length 56)
          10.3.64.72 > x.y.52.23: ICMP 10.3.64.72 udp port 10006 unreachable, length 36
              IP (tos 0xb8, ttl 62, id 26129, offset 0, flags [none], proto UDP (17), length 200)
          x.y.52.23.33530 > 10.3.64.72.10006: UDP, length 172

       

      This issue just turned up on some brand-new 908Es. I'm using the same working config that I have been for some time on a number of other 908Es. Tried on SW v 10.6 thru 10.8 with no difference. Doesn't seem to matter if the 908's firewall is on or off. Nothing new or different on the network/switch side AFAIK.

       

      So what stupid thing am I missing here?