Sx20 network rejected

[allahverdiyev]

I have strange issue with SX20. It was working before, but all of a sudden, I could not make outbound sip uri calls. It tries to connect, but drops immediately. Call history shows network rejected (see attachment).

VCS event logs show call connected.

I could not detect deny in the firewall. 

Sx20 provisioning mode is CUCM.

There is not another SX20 to test calls.

Any idea about the issue?

Regards

[Shayanthan Vannithamby]

This could be due to networking issue, check to see if there is a delay, also verify the network settings ensure they are correct. You can also do a factory reset, if it still persists, check the network.

[allahverdiyev]

Settings are correct, it was working before and nothing has changed. What do you advise relating to delay monitoring? How can we detect it properly?

Regards