I was playing around with voice configuration lately and I started wondering... Am I interpreting the output of this show command correctly?
The setup is pretty straight forward. I have one voice gateway (2811) and a bunch of phones registered to it. The gateway is connected to another 2811 router over an E1 line and the call is terminated to a Cisco IP phone registerd to it.
On the the voice gateway where the call is originated from I've got:
HQ-2#show voice dsp active
DSP DSP DSPWARE CURR BOOT PAK TX/RX
TYPE NUM CH CODEC VERSION STATE STATE RST AI VOICEPORT TS ABORT PACK COUNT
------------------------END OF FLEX VOICE CARD 0 --------------------
So, the first section is pretty clear. For every extension I have two voice channels associated with it, because I'm using "dual=line" configuration.
The second part of the output, where the the active voice channels are listed is where I'm wondering. To me it looks like this:
1. The originating gateway HQ-2 is doing codec transcoding, That is why the media stream between it and the local phone is iLBC.
2. The codec over the E1 line is g711Alaw.
3. The terminating gateway implements standart voice termination function on the E1 line and does not perform any transcoding.
Are my assumptions correct? The thing that is bugging me is... The first output shows that the the codec over the E1 line is iLBC, and then on the terminating gateway the codecs listed in the active voice channels are only g711Alaw. So that's why I'm assuming that the originating gateway does not only standard voice termination but also transcoding and only g711Alaw is used over the E1 line...
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