[Asterisk-Users] RE: Asterisk-Users Digest, Vol 8, Issue 152

[Kevin P. Fleming]

Wei Su wrote:
> I understand Asterisk is more like a B2BUA. But when this INFO request is
> sent to asterisk, asterisk is supposed to bridge the request to the other
> endpoint, right? In what situation, it decides to send a reply; in what
> situation, it decides to bridge the request?

It is not required to do anything with INFO requests at all, it can 
ignore them or reject them if it wants to.

It is possible to bridge the request to the other peer, but keep in mind 
that the other peer might not be SIP at all (IAX2, Zaptel, an 
application, H.323, etc.) Since Asterisk is acting as a PBX, it's free 
to choose what to do with them, if anything at all.

Right now Asterisk only handles one type of SIP INFO packet: the ones 
used for DTMF transmission.