Hi,
I am trying to make a (decent) VoIP call using the following setup:
- Asterix PBX (latest version) running on Trixbox
- pjsua (command line tool) on a Windows XP host PC
- Cellphone (O2) running Windows Mobile 5 and pjsua_wince application
- LAN is connected using a LinkSys WRT54L (PC connected with cable and phone
connected with WiFi)
I manage to make a phone between the O2 and the PC, however the quality is
very poor, with echo and disruptions of the voice. Also, I periodically (~1
sec interval) get "silence noises" when there is no talk.
dq dump from pjsua:
[CONFIRMED] To: "801" <sip:801 at 10.0.0.151 <sip%3A801 at 10.0.0.151>
>;tag=as18eb6d76
Call time: 00h:01m:12s, 1st res in 0 ms, conn in 0ms
SRTP status: Not active Crypto-suite: (null)
#0 PCMU @8KHz, sendrecv, peer=10.0.0.151:10406
RX pt=0, stat last update: 00h:00m:02.781s ago
total 3.5Kpkt 570.8KB (713.6KB +IP hdr) @avg=63.1Kbps/78.8Kbps
pkt loss=0 (0.0%), dup=0 (0.0%), reorder=0 (0.0%)
(msec) min avg max last dev
loss period: 0.000 0.000 0.000 0.000 0.000
jitter : 0.000 3.517 21.375 4.000 2.393
TX pt=0, ptime=20ms, stat last update: 00h:00m:02.375s ago
total 3.5Kpkt 575.4KB (719.3KB +IP hdr) @avg 63.6Kbps/79.5Kbps
pkt loss=0 (0.0%), dup=0 (0.0%), reorder=0 (0.0%)
(msec) min avg max last dev
loss period: 0.000 0.000 0.000 0.000 0.000
jitter : 18.875 21.696 24.375 22.375 1.661
RTT msec : 2.014 5.922 11.016 5.020 2.840
I have the following questions:
1. Why is the PCMU codec selected and not Speex (I have set Speex to be in
the highest priority on both sides)? How can I make it choose something else
other than PCMU?
When I tries setting all Codecs priorities except Speex to zero, I couldn't
establish a conversation.
2. I set --no-vad in the pjsua console on the PC and set:
# define PJMEDIA_CODEC_MAX_SILENCE_PERIOD -1
before deploying the file to the mobile device.
This should have disabled the 'silence noises' but it doesn't. Am I missing
something?
3. Although I use non-routable IPs, I have the entire system on a LAN. Why
does it think I'm behind a NAT and tunnels everything through the Asterix?
Is there a way to tell the software to contact directly?
I've set the following in pjsua_wince.cpp:
// Use this to disable STUN
# define STUN_DOMAIN NULL
# define STUN_SERVER NULL
And it does not seem to have any effect.
4. Was anyone able to succesfully deploy such (or similar) enviorment? Can
you provide some hints?
5. It seems that the changes I make have very little or no effect on the
overall quality. For example, I set:
# define PJMEDIA_SOUND_BUFFER_COUNT 20
and expected to have a very long delay, but it had no effect.
Am I doing something wrong?
--
Tzury Bar Yochay
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