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New Member

Using Cisco 2811 as Gateway between PBX and Asterisk/Trixbox

I have an existing PBX that does not speak SIP. This PBX is connected to two PRI's that all are existing extensions are on. The PBX does speak MGCP and H323. Is it possible to use a Cisco 2811 with DSP's installed as a gateway to route calls from the PBX to the router and then from the router to my Asterisk/Trixbox server for my SIP phones ? Any suggestions on whether I should use H323 or MGCP between the PBX and router ? Does the router have the capability to receive H323 or MGCP, convert this to SIP , and send it to my Asterisk/Trixbox server ? Thanks.

  • IP Telephony
15 REPLIES

Re: Using Cisco 2811 as Gateway between PBX and Asterisk/Trixbox

yes a 2811 with the CUBE software can do everything you need. You can choose to use both hardware/software MTP's for this configuration as well. The configuration from CM to Cube should be H323 depending on your version of CM and out of CUBE to Asterick via SIP. This works with no issues.

New Member

Re: Using Cisco 2811 as Gateway between PBX and Asterisk/Trixbox

Can you explain what "CUBE" stands for ? Also, when you mention "CM" do you mean Call Manager ? I do not have call manager running, this is a third party PBX, not Cisco. Thanks !!

Re: Using Cisco 2811 as Gateway between PBX and Asterisk/Trixbox

CUBE, or IPIPGW will convert SIP-SIP, SIP-H323, or H323-H323.

It's a software upgrade but licensed product (paper).

MTPs are not applicable here because they are an artifact of CUCM which you do not have or use in this call flow.

Integration between two different systems is a common application. You can do many things on CUBE regarding translation, security, header passing/blocking, etc.

Doing a cisco.com search for "Cisco Unified Border Element" will bring up much more information.

hth,

nick

Re: Using Cisco 2811 as Gateway between PBX and Asterisk/Trixbox

I apologizeo on the type PBX. What type of PBX do you have? if it supports H323 then it will work the same way. The CUBE is Cisco Unified Border Element/IP2IP Gateway. Here is the link:

http://www.cisco.com/en/US/products/sw/voicesw/ps5640/index.html')">http://www.cisco.com/en/US/products/sw/voicesw/ps5640/index.html

It is an IOS upgrade that will activate the CUBE, but you will have to pay for the upgrade. It is not covered by smartnet.

New Member

Re: Using Cisco 2811 as Gateway between PBX and Asterisk/Trixbox

No problem. The vendor of PBX is called Vertical Instant Office. It also supports MGCP. Would MGCP be a better choice than H323 ? If i implement H323 do I need to setup a Gatekeeper or will this work without a Gatekeeper ? Thanks !!

Re: Using Cisco 2811 as Gateway between PBX and Asterisk/Trixbox

A MGCP call agent is only supported on something like a BTS or on CUCM. A gateway / CUBE will not control another gateway. The gateway is the controlled side, not controlling.

-nick

New Member

Re: Using Cisco 2811 as Gateway between PBX and Asterisk/Trixbox

Ok. So I have the IP to IP gateway IOS software. I will be using H323 between the Vertical PBX and the Cisco 2811, and then SIP between the Cisco 2811 and Tribox Server.

I still need to know if I have to configure the Cisco 2811 as a gatekeeper, or just a gateway between the PBX and router??

Anyone have any example configs to assist me with my project ?

Thanks again !!

Re: Using Cisco 2811 as Gateway between PBX and Asterisk/Trixbox

This is the configuration guide for CUBE SIP-H323:

http://www.cisco.com/en/US/docs/ios/voice/cube/configuration/guide/vb-gw-h323sip.html

These are the essential global commands:

voice service voip

allow-connections h323 to h323

allow-connections h323 to sip

allow-connections sip to h323

allow-connections sip to sip

h323

emptycapability

Then, whatever dial peers you need to configure.

'debug voip dialpeer' and 'debug voip ccapi inout' are helpful debugging commands.

Here is an example with CUCM SIP-H323:

http://www.cisco.com/en/US/products/sw/voicesw/ps5640/products_configuration_example09186a00808ead0f.shtml

hth,

nick

New Member

Re: Using Cisco 2811 as Gateway between PBX and Asterisk/Trixbox

Why not go h.323 from the PBX directly to the asterisk server and leave the 2811 out of the whole thing?

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