When calling to some phones (like 2797901, 2797956, 2797978) from outside to inside the company, most of the calls connect ok, but some of them (like 20%) they just don’t have audio (neither I can listen something, nor the user on the other side).
What its pretty rare, is that it not only looks to be at random, but also, that if the guy at the opposite side of the phone push the buttons of the iphone, u can listen that sound clearly.:S
The voice gateway is a Cisco 2621XM using c2600-is-mz.122-8.T10
I’m adding the run config, and some outputus I took of the “sh voice call summary” and “sh voice call” while I was having the issue. My call is on the port 1/0:0.2 but I been checking and it also happens on other ports (like 1/0:0.5)
We are using teh controller E1 1/0, for those lines.
I’d been trying to figurate out the problem for a long time, but I don’t know to much about voice.
It sounds like a codec mismatch of some kind. The fact that you can hear the DTMF tone when the far-end presses a button isn't very suprising; It just means that the DTMF tones are being carried out-of-band and re-created on the far end. What kind of IP handsets are you using? If you are using a Cisco IP Phone, you can press the help button (it has a ? on it) twice during a call to see info about that call. It should tell you what codec the phone is sending, and what it thinks it's recieving, and how many packets are coming through.
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