asterisk users - Feb 2005 - Speex pass through on SIP

Hi,

I've seen some answers to this on the mailing list archives but nothing
that seems like the right answer. What I want is for 2 SIP phones to use
speex to talk to each other through 2 asterisk boxes (linked over IAX2)
while only supporting ulaw on the asterisk boxes themselves.

I think a diagram will help ;)

SIP1 <--> *1 <--> IAX2 link <--> *2 <--> SIP2

I want any calls from SIP1 to SIP2 or SIP2 to SIP1 to be able to use
speex OR ulaw (depending on network status)
I want any calls to *1 or *2 to use ulaw only (VM and other features)
since those should be over LAN anyway.

I want the IAX2 link (which is over the internet) to transmit whatever
the SIP phones use (i.e. not going from speex -> ulaw then back
ulaw->speex on the other side)

I need to make sure that if SIP1 puts SIP2 on hold, *1 won't try to send
MOH using speex. In fact, if * is out of the loop it shouldn't be able
to put calls on hold right?

Any idea what the setup I want is for both sip phones and both sides of
the IAX2 connection?

Guills
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