VP350 Nat problem

[juanrobaina]

We have a deployment with 620 T20 behind a NAT working with a Portaone environment in the cloud, all are working fine. We have the same configuration with 20 units of VP350 (keep alive enable) and we try different timing for keep alive intervals but we are unable to receive call in those phone (we receive 480 unavailable), the only thing that resolve the issue momentarily is placing and outbound call from the phone and works for several hours, then we think the NAT is closing the port again. Please advice.

[Yealink Support]

1. Please make sure the keep alive time should be the same as your server.
2. Do your NAT server use options or notify?
3. What is the version of your VP530?

In order to do more troubleshootings, please supply me syslog level 6, config.bin and pcap.
How to Get the Correct Syslog, Config.bin and Trace

[cindyfrese]

(03-24-2014 02:39 PM)Yealink Support Wrote:  1. Please make sure the keep alive time should be the same as your server.
2. Do your NAT server use options or notify?
3. What is the version of your VP530?

This is a great information