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Re: [Linphone-developers] oRTP: 0x7f (decimal 127) received even when no

From: Nicholas J Humfrey
Subject: Re: [Linphone-developers] oRTP: 0x7f (decimal 127) received even when no data is sent
Date: Mon, 5 Jun 2006 19:01:33 +0100

The byte 0x7f is silence in u-law (payload type 0, which is default). I think oRTP does that just to keep the decoder/sound card fed with something, when no data is received (equating to packet loss?).

If you are trying to send text, try changing the payload type/profile.


On 5 Jun 2006, at 11:52, Danilo Šegan wrote:

Hi all,

First I noticed this with my own programs, and then tested it with
rtprecv.c and rtpsend.c: if I simply send any textual file using these
two programs, after the file is completely submitted, and rtpsend.c
exits, rtprecv.c keeps receiving as much 0x7f's as fit the receive
buffer (eg. 160 for rtprecv.c).

Is this a silence indicator and can this be ignored?  Or, am I doing
something wrong?


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