VOIP call rings, user answers but no sound

freenesss · ‎06-26-2009

I have set up VOIP between to sites.

Each site connects from a PBX to router then accross the WAN.

Site A calls site B, phone rings, user answers but there is no sound at either end!!! complete silence.

Can anyone help

Thanks in advance

manish.gupta · ‎06-28-2009

Hi,

I am facing the same problem.But I am connecting the site via VPN client. Call lands on Cisco IPC, IPC rings, user answers but there is complete silence!!

Is VPN , blocking some port of something?

Thanks,

Manish

Prathyush Keeriyatt · ‎06-29-2009

Hi,

No way audio occurs due to the following reasons:

- NAT, PAT and firewalls blocking UDP traffic exist b/w the endpoints.

- Troubles in IP connectivity.

Please check these and revert

franpena2008 · ‎02-17-2011

I do not see firewalls denying udp traffic in the firewalls

Ip connectiviy is seems to be OK. I can ping ip phones from the gateway.

Signaling between ip phones and DECT phones is also OK but cannot hear voice.

10.161.101.248 is the gateway and 10.241.7.24 remote ip phone.

F10R248#sh voip rtp connections
VoIP RTP active connections :
No. CallId dstCallId LocalRTP RmtRTP LocalIP RemoteIP

10 153541 153540 16388 25520 10.161.101.248 10.241.7.24

F10R248# sh log | i 10.241.7.24

Feb 17 10:22:53.196: voip_rtp_create_session: callID=151269, dstCallID=151268 laddr=10.161.101.248, lport=16446,raddr=10.241.7.24, rport=27792, type=3, sig_tos=3, ip_tos=5
Feb 17 10:22:53.216: RTP(15494): ps rx s=10.241.7.24(27792), d=10.161.101.248(16446), pt=18, ts=C60800, ssrc=963B6251, marker=1
Feb 17 10:22:53.228: RTP(9961): fs tx s=10.161.101.248(16446), d=10.241.7.24(27792), pt=96, ts=9EA4A8BD, ssrc=174E65F8, marker=1
Feb 17 10:22:53.236: RTP(15495): fs rx s=10.241.7.24(27792), d=10.161.101.248(16446), pt=18, ts=C608A0, ssrc=963B6251, marker=0
Feb 17 10:22:53.252: RTP(9962): fs tx s=10.161.101.248(16446), d=10.241.7.24(27792), pt=96, ts=9EA4A95D, ssrc=174E65F8, marker=0
Feb 17 10:22:53.256: RTP(15496): fs rx s=10.241.7.24(27792), d=10.161.101.248(16446), pt=18, ts=C60940, ssrc=963B6251, marker=0
Feb 17 10:22:53.272: RTP(9963): fs tx s=10.161.101.248(16446), d=10.241.7.24(27792), pt=96, ts=9EA4A9FD, ssrc=174E65F8, marker=0
Feb 17 10:22:53.276: RTP(15497): fs rx s=10.241.7.24(27792), d=10.161.101.248(16446), pt=18, ts=C609E0, ssrc=963B6251, marker=0

Ming Yuan Chiu · ‎03-01-2011

Can you post configuration on the switchport for the phone that it is connected to and also post snippet of the voice configuration on the router.