The situation is like this. I've got one router (HQ-1) which has one C7965G IP phone registered. This router is connected over E1 line to another router (PSTN) which simulates PSTN-like connectivity. There's also another C7965G IP phone registered to the PSTN router.
I've configured one of the phones to use iLBC as prefered codec. So it works, but when I use these two commands:
HQ-1#show voice call status
CallID CID ccVdb Port Slot/DSP:Ch Called # Codec MLPP Dial-peers
So it appears to me that I've got one input call leg (from the 7965G phone to the HQ-1 router) and another outgoing call leg (from the HQ-1 router to the PSTN router over the E1 line). Which is perfectly fine.
What confuses me is the second output from the PSTN router. Because it shows one input call leg that is using g711 and another call leg to the 7965G phone.
From my understanding the outgoing call leg from HQ-1 to PSTN should be the input call leg to the PSTN router. Shouldn't it use than the same codec, iLBC in this case? In that case where the transcoding takes place?
Am I interpreting the outputs correctly?
Here're also the outputs from "show voice dsp"
HQ-1# show voice dsp
DSP DSP DSPWARE CURR BOOT PAK TX/RX
TYPE NUM CH CODEC VERSION STATE STATE RST AI VOICEPORT TS ABORT PACK COUNT
I'm not aware of any restrictions as far as the codecs are concernd when CME is used.
Transcoding isn't configured on neither of the routers in this setup.
What I'm puzzled with in this output is that it appears to me that in one direction of the E1 line (from HQ-1 to PSTN) the codec used is iLBC, and on the reverse direction (from PSTN to HQ-1) it's G.711. This doesn't make any sense to me? And when E1 line is used, shouldn't the codec always be G.711uLaw?
So maybe I'm not interpreting the outputs correctly. That's why I started this discussion...
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