[Asterisk-Users] Bug in SUBSCRIBE handling : running out of RTP ports

[Sarat Vemuri]

While trying to deploy a bunch of Polycom IP 500 phones, I ran in to the
following.  I limited the RTP ports from 8000-8050 to limit holes in
firewall.  Pretty soon Asterisk ran out of RTP ports.  Traced the problem
back to how * is handling SUBSCRIBE.  A sip structure is allocated as soon
as a request is received, which also allocates RTP ports.  Normally, this is
not a problem as the structure is released as soon as the request is
answered, which is pretty quick.  However, SUBSCRIBE has an expiry header,
till which time * keeps around the call structure and hence hanging on to
those RTP ports.  (SUBSCRIBE doesn't even need an RTP port).  This problem
is amplified by Polycom "Buddy Lists" as each phone subscribes to changes in
extension status of all the "buddy" up to 7 extensions.
 
I just added few lines in handle_request functions to release RTP ports if
it is a subscribe.  Seem to work fine..  Should I send this to Dev list or
somewhere?
 
Hope this helps some one running in to similar problems.
 
Thanks
Sarat.
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