I also get the problem intermittently, on the outgoing leg only.  I have a Sangoma B700 dual BRI card talking to the PSTN and Yealink T20Ps on the inside.  Everything is G.711 so there is no transcoding.  The ISDN incoming calls are answered by a Lua-based IVR, but the choppiness starts after MOH and the call is picked up, or when the extension voicemail greeting is played.  Outgoing calls also have the outbound leg experiencing chopping.  I estimated the chopping to be at around 5Hz or so, which matches the 160octet size being fed into the ISDN G.711.  A reboot cleared all the symptoms (drastic, I know, but I was on a dialup connection on another job and didn't have time to debug).

I will go through and check that all the ptimes match (eg all at 20ms), but it appears that this bug still lives, at least on this git:
> version
FreeSWITCH Version 1.0.head (git-6fe6d8d 2011-11-01 11-52-24 -0500)
John

On 17/10/11 08:55, Raimund Sacherer wrote:
Are you still gettint this Problem? I ran into similiar issues, but it's intermittent ...

best
Ray


From: "Chris Cureau" <cmcureau@gmail.com>
To: "FreeSWITCH Users Help" <freeswitch-users@lists.freeswitch.org>
Sent: Wednesday, August 3, 2011 1:28:22 AM
Subject: Re: [Freeswitch-users] Help with choppy audio after attended        transfer

Latest git doesn't help unfortunately.

More research is beginning to confirm its a codec issue.  When I limit the phone to codes that use 20ms packetization, I hear no incoming audio on outgoing calls.  Incoming calls are okay.  When using All for codes (and the 30ms packetization) I get the choppy voice when leaving MOH.



On Mon, Aug 1, 2011 at 8:34 PM, Anthony Minessale <anthony.minessale@gmail.com> wrote:
can you do make current and try latest git?


On Mon, Aug 1, 2011 at 10:46 AM, Chris Cureau <cmcureau@gmail.com> wrote:
> Anthony,
>
> Thanks for answering...and sorry for the delay.  I've already checked all of
> the ptime settings I can, and all phones plus freeswitch are set to use 20ms
> packetization.  I've even set "scrooge" in the codec negotiation, but I keep
> running into this issue.  I've updated my post with "sofia global siptrace
> on".
>
> I am assuming that the ptime issue happens around line 2462
> (http://pastebin.freeswitch.org/16935)
>
> 2011-08-01 09:12:37.332892 [DEBUG] sofia_glue.c:4711 Audio Codec Compare
> [PCMU:0:8000:20:64000]/[PCMU:0:8000:30:64000]
> 2011-08-01 09:12:37.332892 [DEBUG] sofia_glue.c:2753 Already using PCMU
> 2011-08-01 09:12:37.332892 [DEBUG] sofia_glue.c:4819 Set 2833 dtmf send
> payload to 101
> 2011-08-01 09:12:37.332892 [DEBUG] sofia.c:5599 Processing updated SDP
> 2011-08-01 09:12:37.332892 [DEBUG] sofia_glue.c:3042 Audio params are
> unchanged for sofia/internal/sip:1003@10.0.1.205:5060.
> 2011-08-01 09:12:37.332892 [DEBUG] sofia_glue.c:3052
> sofia/internal/sip:1003@10.0.1.205:5060 Setting audio receive payload in
> Re-INVITE to 0
>
> Could this be an issue with the Aastra'a firmware?  Or maybe the MOH is
> being processed at 30ms instead of 20ms, and the negotiation is not updated
> somehow?
>
> I don't mean to sound ignorant, but I'm really at a loss here...and thanks
> again for any help!
>
> Cheers,
> Chris
>
> On Fri, Jul 29, 2011 at 10:44 AM, Anthony Minessale
> <anthony.minessale@gmail.com> wrote:
>>
>> probably ptime related thing.
>> you should have included the sip trace "sofia global siptrace on"
>>
>>
>> On Fri, Jul 29, 2011 at 12:28 AM, Chris Cureau <cmcureau@gmail.com> wrote:
>> > I'm having some issues with extremely choppy audio after a call has been
>> > sent to another extension via an automated transfer.  The audio is great
>> > when the call is answered.  Shortly after, the transfer button is
>> > pressed
>> > and the incoming call hears music on hold.  The music on hold is sent to
>> > the
>> > caller sounds fine as does the conversation between extensions.  When
>> > the
>> > transfer is completed, the caller hears what sounds like someone
>> > speaking
>> > through a fan (though slower) but incoming audio sounds fine.
>> >
>> > Since it's such a large log, I posted it to the FreeSWITCH pastebin:
>> > http://pastebin.freeswitch.org/16911
>> >
>> > I'm thinking that it has something to do with the transition from MOH to
>> > the
>> > internal extension, but I can't figure out what is happening.
>> >
>> > Any ideas?
>> >
>> > _______________________________________________
>> > Join us at ClueCon 2011, Aug 9-11, Chicago
>> > http://www.cluecon.com 877-7-4ACLUE
>> >
>> > FreeSWITCH-users mailing list
>> > FreeSWITCH-users@lists.freeswitch.org
>> > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
>> > UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
>> > http://www.freeswitch.org
>> >
>> >
>>
>>
>>
>> --
>> Anthony Minessale II
>>
>> FreeSWITCH http://www.freeswitch.org/
>> ClueCon http://www.cluecon.com/
>> Twitter: http://twitter.com/FreeSWITCH_wire
>>
>> AIM: anthm
>> MSN:anthony_minessale@hotmail.com
>> GTALK/JABBER/PAYPAL:anthony.minessale@gmail.com
>> IRC: irc.freenode.net #freeswitch
>>
>> FreeSWITCH Developer Conference
>> sip:888@conference.freeswitch.org
>> googletalk:conf+888@conference.freeswitch.org
>> pstn:+19193869900
>>
>> _______________________________________________
>> Join us at ClueCon 2011, Aug 9-11, Chicago
>> http://www.cluecon.com 877-7-4ACLUE
>>
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>
>
> _______________________________________________
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> http://www.cluecon.com 877-7-4ACLUE
>
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> http://www.freeswitch.org
>
>



--
Anthony Minessale II

FreeSWITCH http://www.freeswitch.org/
ClueCon http://www.cluecon.com/
Twitter: http://twitter.com/FreeSWITCH_wire

AIM: anthm
MSN:anthony_minessale@hotmail.com
GTALK/JABBER/PAYPAL:anthony.minessale@gmail.com
IRC: irc.freenode.net #freeswitch

FreeSWITCH Developer Conference
sip:888@conference.freeswitch.org
googletalk:conf+888@conference.freeswitch.org
pstn:+19193869900

_______________________________________________
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