[Freeswitch-users] rtpmap question PCMU/PCMA

Mon May 31 08:12:11 PDT 2010

Ah ok.
Are you sure your device is not choking because of the T38-related  
lines in the SDP ?
Until now, all the devices I used only advertise T38 in the Re-INVITE,  
and I think (to be confirmed) that's the "standard" way to do it.
I guess there could be a reason not to advertise it in the initial  
INVITE.

As for the missing rtpmap lines, I don't know if it's valid not to  
send them.
I guess it also relies on the device at the other end.

Can you confirm how is this related to FS ?

David Ponzone  Direction Technique
email: david.ponzone at ipeva.fr
tel:      01 74 03 18 97
gsm:   06 66 98 76 34

Service Client IPeva
tel:      0811 46 26 26
www.ipeva.fr  -   www.ipeva-studio.com

Ce message et toutes les pièces jointes sont confidentiels et établis  
à l'intention exclusive de ses destinataires. Toute utilisation ou  
diffusion non autorisée est interdite. Tout message électronique est  
susceptible d'altération. IPeva décline toute responsabilité au titre  
de ce message s'il a été altéré, déformé ou falsifié. Si vous n'êtes  
pas destinataire de ce message, merci de le détruire immédiatement et  
d'avertir l'expéditeur.

Le 31/05/2010 à 16:57, Mark Campbell-Smith a écrit :

> Hi David,
>
> Its an INVITE.  Full invite below:
>
>   INVITE sip:gw+Phonzo at 124.xxx.xxx.xx:5080;transport=udp;gw=Phonzo  
> SIP/2.0
>   Record-Route: <sip:80.232.37.178;ftag=262787ae2a9104a0c7700794a69028aco;lr 
> >
>   Via: SIP/2.0/UDP
> 80.232.37.178;branch=z9hG4bK8a48.ecc54191b911cf6bfd73daeefeae0ada.0
>   Via: SIP/2.0/UDP
> 80.232.37.178 
> :5061;branch=z9hG4bK443b032c2a924807acf39718946e2c9e;rport=5061
>   Max-Forwards: 16
>   From: 010711xxxx
> <sip:711xxxx at 80.232.37.178>;tag=262787ae2a9104a0c7700794a69028aco
>   To: <sip:4610xxxxxxx at 80.232.37.178>
>   Call-ID: M2Q1NjhhNmZjOGJjMDc3ODhlNzUyYzRiM2ZkMjQyZTE.
>   CSeq: 200 INVITE
>   Contact: Anonymous <sip:80.232.37.178:5061>
>   Expires: 300
>   User-Agent: Sippy
>   cisco-GUID: 1658214937-1822691807-2631794736-96895450
>   h323-conf-id: 1658214937-1822691807-2631794736-96895450
>   Content-disposition: session
>   Content-Length: 364
>   Content-Type: application/sdp
>
>   v=0
>   o=Sippy 141730476 0 IN IP4 80.232.37.178
>   s=-
>   t=0 0
>   m=audio 47676 RTP/AVP 8 0 18 101
>   c=IN IP4 213.50.91.3
>   a=fmtp:18 annexb=yes
>   a=rtpmap:101 telephone-event/8000
>   a=fmtp:101 0-15
>   a=sqn: 0
>   a=cdsc: 1 audio RTP/AVP  8
>   a=cdsc: 2 image udptl t38
>   a=cpar: a=T38FaxUdpEC:t38UDPRedundancy
>   a=cpar: a=T38FaxVersion:0
>   a=cpar: a=T38MaxBitRate:14400
>   a=sendrecv
>
> Regards
> Mark
>
> On Mon, May 31, 2010 at 4:29 PM, David Ponzone <david.ponzone at gmail.com 
> > wrote:
>> Mark,
>> This looks like a T38 Re-INVITE, but a weird one.
>> David Ponzone  Direction Technique
>> email: david.ponzone at ipeva.fr
>> tel:      01 74 03 18 97
>> gsm:   06 66 98 76 34
>> Service Client IPeva
>> tel:      0811 46 26 26
>> www.ipeva.fr  -   www.ipeva-studio.com
>> Ce message et toutes les pièces jointes sont confidentiels et  
>> établis à
>> l'intention exclusive de ses destinataires. Toute utilisation ou  
>> diffusion
>> non autorisée est interdite. Tout message électronique est  
>> susceptible
>> d'altération. IPeva décline toute responsabilité au titre de ce  
>> message s'il
>> a été altéré, déformé ou falsifié. Si vous n'êtes pas destinataire  
>> de ce
>> message, merci de le détruire immédiatement et d'avertir  
>> l'expéditeur.
>>
>>
>>
>> Le 31/05/2010 à 16:12, Mark Campbell-Smith a écrit :
>>
>> Hi All,
>>
>> I'm sure I've discussed this before, but I searched through my gmail
>> and google and couldn't find the answer.
>>
>> Below is the SDP parameters from my sip provider.  Is it mandatory to
>> always include the rtpmap details for PCMU/PCMA codes?  For example
>> something like 'a=rtpmap:8 PCMA/8000' and 'a=rtpmap:0 PCMU/8000'?
>>
>> I'm using sipdroid on android and it rejects this with 'codec not  
>> supported'
>>
>> Thanks
>>
>>
>>
>> o=Sippy 141730476 0 IN IP4 xxx.xxx.xxx.xxx
>> s=-
>> t=0 0
>> m=audio 47676 RTP/AVP 8 0 18 101
>> c=IN IP4 xxx.xxx.xxx.xxx
>> a=fmtp:18 annexb=yes
>> a=rtpmap:101 telephone-event/8000
>> a=fmtp:101 0-15
>> a=sqn: 0
>> a=cdsc: 1 audio RTP/AVP  8
>> a=cdsc: 2 image udptl t38
>> a=cpar: a=T38FaxUdpEC:t38UDPRedundancy
>> a=cpar: a=T38FaxVersion:0
>> a=cpar: a=T38MaxBitRate:14400
>> ]
>>
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