There was some talk a week or two ago, about ASA�compatibility�with CM and having to keep them lock step. �Am I running into this kind of issue? �ASA 8.4.2 / CM 7.1.5?<div><br></div><div>Scott<br><br><div class="gmail_quote">
On Wed, Dec 7, 2011 at 12:13 PM, Wes Sisk <span dir="ltr"><<a href="mailto:wsisk@cisco.com">wsisk@cisco.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
SCCP devices advertise capabilities on registration. �Those capabilities are never renegotiated unless video is added/removed/invoked.<br>
<br>
A little insight here -<br>
CM tells the phones the codec it *should* receive in the OpenReceiveChannel sent to the phone. However, the phones do not trust that. �The phone figures out the codec it is receiving based on the first few RTP packets received.<br>
<br>
If you are seeing ?? under codec I would be more suspecting of RTP not arriving at the phone.<br>
<br>
<br>
SIP and H.323 advertise codecs on a per-call basis. �MGCP advertises codecs once during registration.<br>
<br>
Regards,<br>
Wes<br>
<div><div class="h5"><br>
On Dec 7, 2011, at 2:30 PM, Scott Voll wrote:<br>
<br>
can anyone tell me how Codec negotiation works? �Specifically what ports it works on?<br>
<br>
I have telecommuters using IPC 7.0.5 connecting with anyconnect (2.5) connecting to an ASA at the head end. �Calls to inside 7961's work fine.<br>
<br>
but I also have 881's doing site to site VPN with 7961 hanging off the back coming into the same ASA. �That phone can call internal 7961 also.<br>
<br>
The problem comes from IPC telecommuters calling 7961's behind the 881's. �When you place the call, it rings, they answer, the timer increments up. �But with a ?? it does not show a Codec. �It looks like we never negotiate the Codec.<br>
<br>
is this a Version problem? �CM is 7.1.5 and ASA is 8.4.2. �I THINK it worked with ASA version 8.2.4 (but I Can't downgrade to double check).<br>
<br>
Any other ideas?<br>
<br>
I have a TAC case with the ASA team and they are like ya, the vpn connections work.... open a new ticket with the voice team. �And before I did so, I figured you guys are really smart and probably have deal with these kinds of issues.<br>
<br>
<br>
Scott<br>
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