SIPCHANINFO — Retrieves info on a SIP channel
Gets the specified SIP parameter from the current channel.
Valid items are:
peerip
The IP address of this SIP peer
recvip
The source IP address of this SIP peer
from
The SIP URI from the From: header
uri
The SIP URI from the Contact: header
useragent
The name of the SIP user agent
peername
The name of the SIP peer
t38passthrough
1 if T38 is offered or enabled in this channel, otherwise 0