[VoiceOps] Delay on RTP for Inbound Calls

hiersd at gmail.com hiersd at gmail.com
Wed Jan 6 11:23:32 EST 2010

Some of the initial clipping is endemic to the technology. RFC 3960 alludes  
to some of the challenges.


On Jan 6, 2010 3:53am, Ujjval Karihaloo <ujjval at simplesignal.com> wrote:
> 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> 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> 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; 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?

> matt

> 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] On Behalf Of Lee Riemer
> Sent: Tuesday, January 05, 2010 10:15 PM
> To: 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. ie 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 ie 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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