|Subject:||[Linphone-developers] oRTP "pulsing" issues|
|Date:||Mon, 28 Apr 2008 21:40:05 -0400|
I’m using the oRTP library (ortp-0.13.1) in a custom SIP application, and I’m having an issue with the audio channel “pulsing”; it sounds like the latter bits of the waveform are being dropped, or the volume decreases or something like that.
It’s rhythmical, and consistent, and seems to tick at a 20ms interval or so- and I can get it to happen with a few different SIP devices (the x-lite soft phone, and a Snom 370 SIP phone, both registered through asterisk).
I’ve extracted out the code I’m using in my app, into a simple stand alone RTP echo application (it simply does a recv on the session, and sends the same data back to the same session)- I extracted it to make sure it wasn’t something else in my code before I went any further, and it seems to happen with just the oRTP code; I’ve attached the app I’m using. Everything is configured to only use u-law (payload type 0).
I wrote another simple UDP proxy, that simply recv’s packets from a given port, and forwards them (without modification) back to a given ip/port- when I run that app against the phone, the audio sounds perfect (as I would expect it to sound through the oRTP library); this uses the same process through asterisk.
Can anybody see any issues with my implementation of the oRTP library? Does this sound like any known issue with the oRTP library?
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