[VoiceOps] Delay on RTP for Inbound Calls

[Alex Balashov]

What is the temporal delta between

    --------- 200 OK ------->

and

    <--------- ACK ----------

?

On 01/06/2010 01:11 PM, Ujjval Karihaloo wrote:

> Agreed, we do that too...puts 2 sec delays on IVRs. However, we are getting complaints from users who answer their phone - like Your sample office receptionist below.
>
> Ujjval Karihaloo
> VP Voice Engineering
> IP Phone: +13032428610
> E-Fax: +17202391690
>
> SimpleSignal Inc.
> 88 Inverness Circle East
> Suite K105
> Englewood, CO  80112
>
>
>
> -----Original Message-----
> From: David Hiers [mailto:hiersd at gmail.com]
> Sent: Wednesday, January 06, 2010 10:40 AM
> To: Ujjval Karihaloo
> Cc: voiceops at voiceops.org
> Subject: Re: Re: [VoiceOps] Delay on RTP for Inbound Calls
>
> Of course, even if the protocol did not have such gaps, there is a lot
> of state that has to be managed in a lot of devices in the time
> between the thoroughly frappachinoed receptionist hitting the answer
> button and spewing
> "ThankYouForCallingMetropolisSpeedSpeakingInstitute!ItsAGreatDayToSuperChargeYourSpeachHowMayIDirectYourCall"
> into the headset.
>
> I"ve often considered re-recording all stored prompts and
> announcements to prefix 2 seconds of silence, as well as grinding some
> 'ludes into the frap mix.
>
> David
>
>
>
>
>
> On Wed, Jan 6, 2010 at 8:23 AM,<hiersd at gmail.com>  wrote:
>> Some of the initial clipping is endemic to the technology. RFC 3960 alludes
>> to some of the challenges.
>>
>>
>> David
>>
>>
>>
>>
>> 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. 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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>>>
>>> VoiceOps at voiceops.org
>>>
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>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
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-- 
Alex Balashov - Principal
Evariste Systems
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