[Asterisk-Users] canreinvite and codec negotations... and NAT

[Billy Huddleston]

I've gotten canreinvite=yes to work with a sip device behind NAT!! You
*MUST* port forward the SIPPort to in your gateway router to your phone.
This is a MUST.

Okay, now on to my problem..  I have people who will be using ulaw, and I
have people who will be using g729.. I want to set it up so that canreinivte
will work.. I have a single cisco gateway..
Asterisks isn't handling the negotation between the 2 devices very well..
For example..

[gateway]
type=friend
host=1.2.3.4
canreinvite=yes
qualify=200
dtmfmode=rfc2833
context=default
disallow=all
allow=ulaw
allow=g729

[123]
type=friend
secret=abc
nat=yes
host=dynamic
canreinvite=yes
qualify=200
context=default
dtmfmode=rfc2833
mailbox=2199
callerid="Joe Blow" <123-456-7890>
disallow=all
allow=g729

[321]
type=friend
secret=abc
nat=yes
host=dynamic
canreinvite=yes
qualify=200
context=default
dtmfmode=rfc2833
mailbox=321
callerid="Joe Blow" <321-456-7890>
disallow=all
allow=ulaw


Okay, in this configs, gateway would be my cisco 26xx gateway..  ext 123
would be a g729 customer.. and 321 would be a ulaw customer.  When someone
calls ext 123, the cisco send the call to asterisk, it *WILL* use ulaw...
then it will initiate a call to g729, well... Now we have a codec mismatch,
and canreinvite won't work... EVEN though gateway can do g729.. ext 321
won't have any problems.. It'll work fine for them..  What can we do to get
this to work like it should?

Thank, Billy


             +--------------------------------------------------+
             | Billy Huddleston    Senior System Administrator  |
             | Net-Express                  http://www.nxs.net  |
             | 114 Sherway Rd.             Voice: 865-691-2011  |
             | Knoxville, TN  37922          Fax: 865-691-9894  |
             | billy at nxs.net                                    |
             +--------------------------------------------------+