[Freeswitch-users] Stutter on ringtone - incoming calls only

Brian West brian at freeswitch.org
Mon Mar 7 21:01:47 MSK 2016


https://wiki.freeswitch.org/wiki/Provider_Configuration:_Callcentric

The last bit is what you need.

<!-- There are two other options such as generous, greedy, but scrooge
seems to work with CallCentric -->

<param name="inbound-codec-negotiation" value="scrooge"/>




On Sun, Mar 6, 2016 at 7:57 PM, Karl Schmidt <karl at xtronics.com> wrote:

> OK - this bit seems likely:
>
>
> 2016-03-06 14:48:04.240958 [WARNING] switch_core_media.c:2042 Asynchronous
> PTIME not supported,
> changing our end from 30 to 20
> 2016-03-06 14:48:04.260851 [DEBUG] switch_core_media.c:2414 Changing Codec
> from PCMU at 30ms@8000hz to
> PCMU at 20ms@8000hz
>
> earlier in the log:
> Local SDP:
> v=0
> o=FreeSWITCH 1457269929 1457269930 IN IP4 192.168.1.200
> s=FreeSWITCH
> c=IN IP4 192.168.1.200
> t=0 0
> m=audio 27354 RTP/AVP 0 13
> a=rtpmap:0 PCMU/8000
> a=ptime:30
> a=sendrecv
> m=audio 27354 RTP/AVP 0 8 9 3 13
> a=rtpmap:0 PCMU/8000
> a=rtpmap:8 PCMA/8000
> a=rtpmap:9 G722/8000
> a=rtpmap:3 GSM/8000
> a=ptime:20
> a=sendrecv
>
>
> So I'm guessing that the PTIME bit is the cause - I found some earlier
> threads and tried
> un-commenting : rtp-autofix-timing=false in sip_profiles/internal.xml
>
>
> But no joy.
>
> Shouldn't the Asynchronous PTIME  be negotiated before the ringing is set
> up?
>
> ( Call audio is fine - just this ringtone phase on incoming calls )
>
>
>
> On 03/05/2016 03:04 PM, Michael Collins wrote:
> >
> >
> > On Fri, Mar 4, 2016 at 3:56 PM, Karl Schmidt <karl at xtronics.com <mailto:
> karl at xtronics.com>> wrote:
> >
> >     When people call in (via callcentric) - they hear a stutter in the
> ringtone.
> >
> >     My understanding is that the ringtone is generated by freeswitch -
> looks like here:
> >
> >
> >     <action application="set" data="transfer_ringback=${us-ring}"/>
> >
> >
> >     We are running the Debian release - 1.4.26~37-1~jessie+1
> >
> >     Could be this is a new 'feature'? Never sure.
> >
> >     Anyone else seeing this?
> >
> >     I'm thinking the ringtone might be using a different CODEX?
> >
> > You can be absolutely certain of what's happening by taking a pcap of
> the SIP and RTP that are
> > leaving the box when the call comes in from Callcentric. Verify that
> you're sending a 183 w/SDP and
> > that there's actual early media leaving your system. If there is,
> analyze the RTP and see if the
> > stutter can be heard there. If it's PCMU then Wireshark is great for
> this kind of thing. (Lots of
> > info in Confluence on packet captures
> > <https://freeswitch.org/confluence/display/FREESWITCH/Packet+Capture>
> and analysis
> > <https://freeswitch.org/confluence/display/FREESWITCH/Wireshark+How+To>
> if you need a reference.)
> >
> > The pcap analysis should at the very least help you narrow down where
> the stutter is coming in to
> > play and where to go next.
> >
> > -MC
>
>
>
> --
>
> --------------------------------------------------------------------------------
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>
> Karl Schmidt                                  EMail Karl at xtronics.com
> Transtronics, Inc.                              WEB
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>
> As a bright friend explained as to why he doesn't watch any TV;
> All we have is time - best not to waste it. kps
>
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-- 

*Brian West*
brian at freeswitch.org


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