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

[Wes Sisk]

typo - tendem -> tandem.  My apologies.  A bit difficult to search and 
do homework with incorrect spellings.

Wes Sisk wrote:

> 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
>> (704) 905-4604 cell
>> aim: macmedley01
>> medley at appiaservices.com
>> <https://puck.nether.net/mailman/listinfo/cisco-voip>
>> You can now call our Support Line 877-277-4297
>>
>>
>>
>>
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