[cisco-voip] H323 to SIP & vice-versa

[Wes Sisk]

Mike,

Traditionally IOS was not allowed to "tendem" VOIP calls.  Meaning - the 
router would never successfully 'forward' a call through this call path:

cm1-----h323-------IOS gw----h323---cm2

This applied to all VOIP protocols as IOS was not programmed to perform 
the internetworking required to interpolate between the 2 VOIP protocols.

However, the recent addition of the IP-IP gateway feature in IOS is 
targeted at just such a call flow.  I have not seen the call flow 
SIP--IOS---h323, but you might get lucky.

/Wes

Mike Roberts wrote:

>The message below was posted to the list back in April of this year.  Has
>anyone experimented or made any progress getting an IOS gateway to translate
>between H323 and SIP?  My SIP phones are connected to an Asterisk server,
>which has a SIP trunk to a Cisco IOS gateway.  My SCCP phones are connected
>to a Callmanager server, which has an H323  connection to the same Cisco IOS
>gateway.  I am trying to allow the phones to call each other.
>
>SIP Phones -- Asterisk -- SIP/Cisco IOS Gateway/H323 -- Callmanager -- SCCP
>Phones
>
>Other options/suggestions are of course welcomed and appreciated.
>
>Thanks in advance,
>Mike
> 
>------------------------
>
>Cisco Gateways can act as SIP User Agents (endpoints, basically). 
> 
>I don't know that they would be able to translate from an inbound SIP
>request to H323 well, as that would be a "Voip hairpin" - something the
>routers couldn't do until the very latest 12.3 code.  I've never tried this
>code so I can't say it will work.
> 
>I'm assuming it'd look something like this:
> 
>Service Provider -> Network connection -> your gateway -> CallManager
> 
>In this case, with 12.3 code, you could make a VoIP Peer with a SIP session
>target, and an H323 Voip Peer with CallManager as the target.  As I said,
>this is supposed to work in the very latest 12.3, I couldn't say if it does,
>or how well it might work (my 12.3 experiences have all been very bad so
>far).
>
>________________________________
>
>From: cisco-voip-bounces at puck.nether.net
><https://puck.nether.net/mailman/listinfo/cisco-voip>  on behalf of medley
>at mac.com <https://puck.nether.net/mailman/listinfo/cisco-voip> 
>Sent: Fri 4/2/2004 4:03 PM
>To: cisco-voip at puck.nether.net
><https://puck.nether.net/mailman/listinfo/cisco-voip> 
>Subject: [cisco-voip] SIP Gateway and CCM
>
>
>I know that CCM 3.3(x) doesn't support SIP natively; I'll have to wait for
>CCM 4.0(x) for native SIP trunking.
> 
>For now, can I use an IOS gateway to translate between H323 and SIP? I'm
>thinking CCM connects to an IOS H323 GW. The IOS H323 GW connects to a SIP
>Gateway.
> 
>We are looking at connecting to another service provider that really wants
>us to use SIP instead of H323 to connect to their gateways.
> 
>tm
> 
> 
> 
>________________________________________________
>Tim Medley
>Appia Communications
>(231) 929-0970 x112
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>medley at appiaservices.com
><https://puck.nether.net/mailman/listinfo/cisco-voip> 
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