05-08-2012 10:46 AM - edited 03-17-2019 11:09 PM
Hi guys, can you help me with that?
Issue: After 60 minutes exactly call drop between Polycoms.
Scenario:
POLYCOM -- GW/Firewall: 3845 -- POLYCOM
Call from Polycom to Polycom's IP.
I try to modify with commands like:
ip inspect tcp idle-time "x"
h323
h225 timeout tcp call-idle never
h225 timeout t302 2
h225 timeout setup 3
call preserve
So, the result its the same...
Any ideas???
Solved! Go to Solution.
05-15-2012 02:47 PM
I think this is due to the firewall. The h323 call is set up it is on port 1720 but after that the call continues on the higher RTP ports. There is no keep alive mechanism over port 1720 so the firewall considers it dead by default after 1 hour and kills your call.
One option would be move to SIP.
You can also try increasing the TCP idle time
rtr-01(config)#ip inspect tcp idle-time ?
<1-2147483> Timeout in seconds
Regards,
Jesse
05-15-2012 02:47 PM
I think this is due to the firewall. The h323 call is set up it is on port 1720 but after that the call continues on the higher RTP ports. There is no keep alive mechanism over port 1720 so the firewall considers it dead by default after 1 hour and kills your call.
One option would be move to SIP.
You can also try increasing the TCP idle time
rtr-01(config)#ip inspect tcp idle-time ?
<1-2147483> Timeout in seconds
Regards,
Jesse
05-20-2012 01:19 AM
Hi Mauro,
whatever Jesse has pointed is right...the initial call setup ports were 1720 (h.323) or 5060/5061 (SIP).
once the call setup happens the media routing done via different ports and the initial setup ports are not used any more.
Firewall as a security measure closes the initial signaling port which is idle for long time. However during the call when the party tries to exchange the keep alive messages and its not reached to other side the other party would think that the remote party has disconnected the call.
For this reason we never recommed to use TCP/H.323/SIP packet inspection. If you use them then you should atleast put sufficient high value so that it doesn't affect your call.
Thanks
Alok
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