[VoiceOps] Delay on RTP for Inbound Calls

Ujjval Karihaloo ujjval at simplesignal.com
Wed Jan 6 06:53:29 EST 2010

On Polycoms  we are running 3.1.2 on most, some are running latest 3.2.2.

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 always without fail…anyone experienced that?

I will take it up with Level 3.

Ujjval Karihaloo

On Jan 6, 2010, at 12:54 AM, "Lee Riemer" <lriemer at bestline.net<mailto:lriemer at bestline.net>> wrote:

I dug up the old email and they upgraded to 3.1.3.

On Jan 5, 2010, at 11:55 PM, Ujjval Karihaloo
<ujjval at simplesignal.com<mailto:ujjval at simplesignal.com>> wrote:

Agreed, Just checked the RTP timestamps for the RTP Stream from my
SBC to level 3 Media gateway  - Time and Seq numbers look perfect
with gaps or  no issue there at all.

Ujjval Karihaloo

-----Original Message-----
From: Matt Yaklin [mailto:myaklin at g4.net]
Sent: Tuesday, January 05, 2010 10:50 PM
To: Lee Riemer
Cc: Ujjval Karihaloo; <mailto:voiceops at voiceops.org> voiceops at voiceops.org<mailto:voiceops at voiceops.org>
Subject: Re: [VoiceOps] Delay on RTP for Inbound Calls

On Tue, 5 Jan 2010, Lee Riemer wrote:

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

If that was the case would not his captures of the traffic and the
resulting replay be mangled at every point me mentions below?


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: <mailto:voiceops at voiceops.org> 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

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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