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Incoming SIP trunk call authorization by source IP

cgm
Level 1
Level 1

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 1

Nathan Compton
Level 4
Level 4

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.