Public bug reported:
Binary package hint: empathy
This bug actually covers some observations and issues with functionality
in trying to make use of Empathy SIP with local SIP servers.
First, empathy always binds locally to port 5060. This is actually
rather inconvenient especially if needing to run multiple user agents,
and hence most SIP clients have a means to specify alternate ports for
the user agent (and also for RTP). Related to this, rather curiously,
empathy does not seem to register itself using the port SIP is bound to
(and the SIP protocol is connected to), but from another, ephemeral UDP
port that is created to send a SIP message. To support NAT situations,
many SIP servers prefer to reply directly to the "apparent" port and
peer socket address/port# where the SIP udp message appears to
originated from, and this seems to explicitly fail in the case of
empathy SIP. I was going to get a trace to see if Empathy sets a
rport=5060, which I think would make sense to do in the given situation.
Once I have time to do a trace (wireshark), I will comment on this
further.
** Affects: empathy (Ubuntu)
Importance: Undecided
Status: New
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Empathy SIP Issues - karmic beta
https://bugs.launchpad.net/bugs/449984
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