[VoiceOps] Delay on RTP for Inbound Calls

Ujjval Karihaloo ujjval at simplesignal.com
Wed Jan 6 00:47:12 EST 2010

Yes, we are running 3.1.2 on most, some are running latest 3.2.2.
Do you remember the exact firmware version you had issues with.

Level 3 has mentioned RTP SSRC could b an issue, but they have no firm data backing it up. It also happens with Asterisk based VoIP PBX's...

Ujjval Karihaloo

From: Lee Riemer [mailto:lriemer at bestline.net]
Sent: Tuesday, January 05, 2010 10:43 PM
To: Ujjval Karihaloo
Cc: voiceops at voiceops.org
Subject: Re: [VoiceOps] Delay on RTP for Inbound Calls

I forgot, we had this issue with invalid RTP sequence numbers with old Polycom firmware.   Are you using Polycom phones?

On 1/5/2010 11:31 PM, Ujjval Karihaloo wrote:
I trace a call...on my cell phone I hear the first 1 -2 seconds clipped...however the trace sounds fine....

Traced at SBC side facing Level 3
Traced at SBC side facing Customer (who receives inbound call)
Traced at Customer Prem

All the above 3 traces the Audio sounds fine, but on my cell phone I miss the first 2 seconds.

Ujjval Karihaloo

From: voiceops-bounces at voiceops.org<mailto:voiceops-bounces at voiceops.org> [mailto:voiceops-bounces at voiceops.org] On Behalf Of Lee Riemer
Sent: Tuesday, January 05, 2010 10:15 PM
To: voiceops at voiceops.org<mailto:voiceops at voiceops.org>
Subject: Re: [VoiceOps] Delay on RTP for Inbound Calls

Have you captured via wireshark and replayed?  Do you hear the same delay?  Is there a delay between the OK (answer) and the audio?

On 1/5/2010 8:22 PM, Ujjval Karihaloo wrote:
Hi Guys;

   We have noticed that sometimes when calling into our DIDs (Level 3 DIDs), there is a 2-3 second lag. i.e. Cell phone caller (party A) calls into a DID (Party B) that is on our network (Broadsoft Softswitch), Party B answers and sayd 1,2,3,4,5 - but the Party A only hears 4, 5...The part i.e. 1,2,3 get cut off.

Plus it is sporadic and difficult to reproduce, was wondering if folks have encountered this and any good troubleshooting techniques you can recommend.

Ujjval Karihaloo


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