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cgm
New Member

Incoming SIP trunk call authorization by source IP

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

1 REPLY

There is no way I know of to

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.

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