How to block spam calls at IOS gateway, SIP Trunk

I have a 2811 acting as a SIP gateway to my SIP carrier.  Some of my users are getting spammed
by a particular telephone number.  I would like to just send calls originating from this particular number to the bit bucket.  How best to do this?  Thanks.
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amigan_99Network EngineerAsked:
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gheistCommented:
Particular number or particular IP?
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cordeosCommented:
If it is a particular calling number, and the calling-party is correctly shown in the SIP setup message from your provider, then you can create a dial-peer in the 2811 config to match exactly on "calling-party" and dump to a non-existent VoIP destination IP address or extenstion number.

Hope this helps.
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Steve JenningsSr Manager Cloud Networking OpsCommented:
Much easier if it's a particular IP. Just block that IP, less overhead on the router.

So, does all traffic get proxied through your provider? Including media? If so (doubtful) then only allow SIP traffic explicitly from your provider. If not, good luck with blocking spam calls. Because if you have a public facing device with port 5060 open, you will invite all sorts of nonsense attacks. That's why larger providers use SBCs . . .

Good luck,
SteveJ
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amigan_99Network EngineerAuthor Commented:
All of the calls from one IP address - our SIP trunking provider.  Rather it is a particular calling number which is being disruptive.
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Steve JenningsSr Manager Cloud Networking OpsCommented:
Ahh, then you will be forced to use the 'dial plan' option . . . or call your provider and report the issue. If they are worth the money you pay them, they should help you.

Good luck,
SteveJ
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Steve JenningsSr Manager Cloud Networking OpsCommented:
Ahh, then you will be forced to use the 'dial plan' option . . . or call your provider and report the issue. If they are worth the money you pay them, they should help you.

Good luck,
SteveJ
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amigan_99Network EngineerAuthor Commented:
TY
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