[Freeswitch-users] Speex transcoding question

Bruce Hopkins jbrucehopkins at gmail.com
Tue Mar 16 03:36:01 PDT 2010

Please ignore this last email.  I think I have missed out something I hav
already been told.  Sorry for the waste of bandwidth.


On 16 March 2010 10:30, Bruce Hopkins <jbrucehopkins at gmail.com> wrote:

> Hi,
> I am having trouble getting my configuration  right so that I can have a
> call transcoded to Speex wideband from another codec (alaw or g.722).
> If both phones use Speex wideband with no transcoding required by FS, the
> call succeeds though.
> My codecs are listed in vars.xml as follows:
>  <X-PRE-PROCESS cmd="set" data="global_codec_prefs=speex at 32000
> @20i,speex at 16000h@20i,G722,G7221 at 32000h,G7221 at 16000h,PCMA,PCMU,GSM"/>
> <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=speex at 32000
> @20i,speex at 16000h@20i,G722,G7221 at 32000h,G7221 at 16000h,PCMA,PCMU,GSM"/>
> However if I make a call from a phone A using, say, g.722 to a phone using
> Speex wideband, the SDP in the invite from phone A to phone B does not
> include Speex wideband.  In fact the SDP includes speex/8000 even though
> speex/8000 is neither enabled in vars.xml, not in either of the phones.
> Here is the codec listing in  the SDP of the INVITE from Freeswitch to phone
> B (from Wireshark) :
> Media Attribute (a): rtpmap:9 G722/8000
> Media Attribute (a): rtpmap:99 SPEEX/8000
> Media Attribute (a): rtpmap:115 G7221/32000
> Media Attribute (a): fmtp:115 bitrate=48000
> Media Attribute (a): rtpmap:107 G7221/16000
> Media Attribute (a): fmtp:107 bitrate=32000
> Media Attribute (a): rtpmap:8 PCMA/8000
> Media Attribute (a): rtpmap:0 PCMU/8000
> Media Attribute (a): rtpmap:3 GSM/8000
> Media Attribute (a): rtpmap:101 telephone-event/8000
> Media Attribute (a): fmtp:101 0-16
> Media Attribute (a): rtpmap:13 CN/8000
> Media Attribute (a): ptime:20
> Could anyone tell me what I am doing wrong please?
> Many thanks
> Bruce
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