CCM 3.3

[julienf28]

We are getting Voice Spam on our VoIP systems. We're currently using Cisco Call Manager 3.3

Is there any ways to block incoming calls from an outside source?

[Rob Huffman]

Hi Julien,

This is possible if the Gateway uses H.323, there is no way using MGCP :( Many have tried .........

Mahesh @ Cisco

http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Unified%20Communications%20and%20Video&topic=IP%20Telephony&CommCmd=MB%3Fcmd%3Dpass_through%26location%3Doutline%40%5E1%40%40.1ddf8746/2#selected_message

TAC Case from Jorge

http://www.ciscotaccc.com/kaidara-advisor/voice/showcase?case=K15182736

Another good related thread (answers from both Mahesh and Jorge)

http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Unified%20Communications%20and%20Video&topic=IP%20Telephony&CommCmd=MB%3Fcmd%3Dpass_through%26location%3Doutline%40%5E1%40%40.1ddf1257/5#selected_message

Hope this helps!

Rob

[julienf28]

This helps a lot except I've taken look at our gateways and they are indeed MGCP :( So that said, I will do some more research on my part but would you know what it would take to switch from MGCP to H.323?

Thanks

[Rob Huffman]

Hi Julien,

This would be a very complicated (but not impossible) change due to the way H.323 is configured.

Adding a Cisco IOS H.323 Gateway

Follow these procedures to add a Cisco IOS H.323 gateway to Cisco CallManager.

Before You Begin

Before configuring a Cisco IOS H.323 gateway for use with Cisco CallManager, you must configure the gateway by using the Cisco IOS command-line interface (CLI). Compared to MGCP gateways, H.323 gateways require more configuration on the gateway because the gateway must maintain the dial plan and route pattern.

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a00802deb06.html#wp1311511

I might be tempted to speak with your service provider to see what they can do before I went this route :)

Hope this helps!

Rob