I'm having a problem with some customers sitting behind "hopefully SIP
aware" routers doing NAT. These routers translate port 5060 to something
different (ie. 10001) in order to be able to connect more than one SIP client on
a single NATted LAN.
Unfortunately, after a while the router seems to "forget" the NAT
table, ie. which port belongs to which SIP client on the LAN. This happens with
different router brands (Alcatel, Zyxel).
Maybe the expiration is set too long? Is there a common standard or a maximum
recommended value for these situations? I think 60 minutes is definitely too
much, 5 minutes is too short... is there a better way than "trial and
error" to find out a good value for this?
Another question: in a "sip show peer" screen i see the following
values
Expire : 27345
Expiry : 900
What's the difference between them?
Furthermore: if the client supports STUN or other NAT traversal methods, do I
need to use them, or will Asterisk take care of everything? We always have
Asterisk in the media path, so clients never talk to each other directly.
Thanks
-Manuel
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Ticinocom SA - Via Stazione 5 - 6600 Muralto
Tel 0844 007070 - Fax 0844 007071
http://www.ticinocom.com
