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Re: Soundpoint 330 takes a very long time to detect dead TCP connection

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My suggestion would be to switch to UDP instead of TCP.

 

TCP support was not very mature when these phones were in their heyday, and has been improved a lot since then, even though people using TCP as their primary transport for SIP is still only a small percentage.

 

Another option is to implement a firewall that allows you to tune the connection tracking, eg pfSense, which you could set to the "aggressive" NAT mode:

 

aggressive – this expires idle connections more quickly. It makes more efficient use of CPU and memory but can drop legitimate connections. This is best used with low-latency connections.

 

This may cause the connections to be forcefully reset by the pfSense firewall, which the phones may react to by receiving the RST packet, and restart their communications more quickly.


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