[Asterisk-Users] Anyone experience with early dial?

[Olle E. Johansson]

Holger Schurig wrote:

> I keep replying to myself quite often.
> 
> As it turned out, this is a problem with incrementing CSEQ on the 
> Grandstream. I don't have the clue if the SIP specification says that you 
> have to increment it, but the GS sometimes sends a different SIP message 
> with the same CSEQ. Here's an example, only messages from the GS are 
> there:
> 
> CSEQ        Message
> 20426       INVITE
> 20426     * INFO, DTMF=0
> 20427       INFO, DTMF=9
> 20428       INFO, DTMF=1
> 20429       INFO, DTMF=4
> 20430       INFO, DTMF=1
> 20431       INFO, DTMF=1
> 20432       INFO, DTMF=5
> 20432     * CANCEL
> 20432     * ACK
> 
> 
> Asterisk ignores the SIP messages marked with *. Therefore, it ignore the 
> digit after the first 0.
> 
> And it ignores the CANCEL, but fails in a friendly way.
> 
> It also ignores the ACK to Asterisk's CANCEL (not shown) and because of 
> this one can see an error like this:

Another strange observation, maybe a bug, is that the INVITE from the GS
is never answered properly so the call is never started, really. The INVITE
is propably overwritten with the INFO, which is answered with a 200 OK.
Strange, indeed.

But the GS should not send the INFO with the same CSEQ...

/O