Re: [Linphone-users] Softphones as fax carrier

[Darren Longhorn]

On 25/06/13 09:47, geo cherchetout wrote:
> Le 24/06/2013 14:44, *Darren Longhorn* wrote:
>
>> Can you control the amount of data per packet? I think default for g.711
>> over RTP is 20mS? Maybe try 10mS?
>
> Capturing streams with wireshark during phone conversations between
> softphones and pstn subscriber, I can see all sent and received RTP
> packets are 214 bytes long, as in Linphone as in Ekiga, with 20 ms
> *mean* interval. But there is a difference between the two softphones:
> While Ekiga sents one packet every 20 ms without exception (as long as
> I can see), Linphone sents almost always two packets in the same
> millisecond with 30 or 40 ms intervals. One packet with 20 ms interval
> is the exception.
> I don't think this is an inconvenience but I am a few surprised.
>
> (Received packets intervals are always 20 ms +/- jitter.)
>

That may well be your problem. Fax reception can be very sensitive to
jitter.
--
Darren Longhorn
Red Embedded

This E-mail and any attachments hereto are strictly confidential and intended 
solely for the addressee. If you are not the intended addressee please notify 
the sender by return and delete the message.

You must not disclose, forward or copy this E-mail or attachments to any third 
party without the prior consent of the sender.

Red Embedded Design, Company Number 06688253 Registered in England: The 
Waterfront, Salts Mill Rd, Saltaire, BD17 7EZ