[VoIP] Missed Calls

[John R. Covert]

The behaviour Paul describes is exactly what would happen if his
IAX2 port isn't forwarded.  Callers would attempt to connect to
port 4569 at his firewall, which would ignore all calls (that
explains the "Max retries exceeded" message John Novack reported).

However, if there had recently been an outbound IAX2 call to the
address of another CNET member, when that member calls back, the
firewall would still have the IAX2 port open.

Lee wrote:

>5060 - SIP (I forward TCP/UDP since I can't remember which it is)

SIP can be done with either, but it's universally done only with UDP.
CNET doesn't use SIP.

>4569 - IAX2 - UDP

This is the main requirement for CNET.

>10000 - 20000 - RTP - UDP

But only if using SIP.  On IAX2 everything goes on 4569.

>5036 - IAX - UDP

No one uses this anymore.

/john