[Asterisk-Users] Can't connect KPhone to asterisk

[Clif Jones]

A typical response from the SIP UAS if no intersecting media types are 
found is:
415 Unsupported Media Type
Some user agents also add a warning header to tell you that it couldn't 
find a
usable CODEC.


Maciek Kaminski wrote:

> Regovich, Timothy wrote:
>
>> Not ACK'ing an invite can be problematic for the statemachine.  
>> Without the
>> ACK, the Dialog is not in  acorrect state.
>>
>> As for the SDP goes, the KPHONE is offering what it can accept, and 
>> asterisk
>> is doing the same.  There is no restriction that they must match.  
>> You can
>> change your offer in the ACK, or with a re-INVITE.
>>  
>>
> Well, they must intersect:
> "For streams marked as sendrecv in the answer, the "m=" line MUST 
> contain at least one codec the answerer is willing to both send and 
> receive, from amongst those listed in the offer. The stream MAY 
> indicate additional media formats, not listed in the corresponding 
> stream in the offer, that the answerer is willing to send or receive 
> (of course, it will not be able to send them at this time, since it 
> was not listed in the offer).
>
>> As for the immediate transmission : yeah, it does seem a little strange
>> doesn't it?  But that is the way that I have seen almost all UAs 
>> work.  The
>> implication is that your offer must be a valid, not a conditional 
>> offer :
>> when you say you accept GSM on port 8000, you better have a listener 
>> on 800
>> ready to go.  
>>
> Optimistic strategy...
>
> Maciek Kaminski
>
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