asterisk users - Jul 2005 - SIP reinvite on calls over multiple Asterisks

Dear all,

Does reinvite work for a SIP to SIP call if there are more than one 
Asterisk between the clients? An example scenario:

 A ---> |Asterisk 1| ---> |Asterisk 2| ---> B

client A behind Asterisk 1 calls client B behind Asterisk 2, after the 
connections have been established, the Asterisks issue reinvites and 
they will step out of the media path so that RTP traffic will stream 
directly between the clients.

If it works, does the protocol between Asterisks need to be SIP or can 
it also be IAX2, for example?

I have tested reinvite when the clients are registered to the same 
Asterisk server but at the moment I can not test if it works in the 
scenario described above.

Thanks,


Mikko Suniala

Mikko Suniala wrote:
> client A behind Asterisk 1 calls client B behind Asterisk 2, after the 
> connections have been established, the Asterisks issue reinvites and 
> they will step out of the media path so that RTP traffic will stream 
> directly between the clients.
Yes. The media path will collapse down to the endpoints no matter how 
many Asterisk servers are in the middle, presuming the IP connectivity 
between each pair of endpoints during the transition is clear (no 
firewall/NAT issues).
> If it works, does the protocol between Asterisks need to be SIP or can 
> it also be IAX2, for example?
It must be SIP.