Incoming SIP trunk call authorization by source IP

[cgm]

Hi,

it seems that UCM denies incoming calls from unknown sources by default with 503 (service unavailable).

This is supported by the following paragraph in a doc:

Before it accepts an incoming call, Unified CM verifies whether a trunk is defined to the remote address from which the call is received.

Is there a way to disable that ?

-Carlos

[Nathan Compton]

There is no way I know of to disable that, but you can configure a SIP Trunk for the IP addresses you are receiving calls from, but not configure anything for outgoing.  If you are expecting calls from ALOT of different IP addresses, a CUBE gateway may be the best option.