[Users] Event: keep-alive

[Papadopoulos Georgios]

Hello,

Certain user agents send a NOTIFY message with the header
Event: keep-alive
Our server responds with a 501 Not Implemented message. 

Does anyone know if this is correct behaviour? Should it respond with a
200 Ok in order for the user agent to work?
I am assuming that any response should be enough to keep the NAT binding
alive, but maybe I am wrong.

thank you for any help.

George Papadopoulos

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