Mailing List Archive: H323 to SIP & vice-versa

H323 to SIP & vice-versa

Jun 22, 2004, 10:16 AM

Post #1 of 4 (2369 views)

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

Re: H323 to SIP & vice-versa [ In reply to ]

tarko at lanparty

Jun 22, 2004, 10:35 AM

Post #2 of 4 (2302 views)

Permalink

hello!

> 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.

Well, asterisk also supports H323. So why don't you just define H323 trunk
between asterisk and CCM and create some routings so CCM calls directly to
astering and vice-versa?

Or perhaps you have tried it and failed? Make sure you have recent asterisk
and oh323 H323 stack, asterisk 0.6 or so and it's native H323 stack were
broken when I last did this kind of interconnection. More recent ones work
well.

--
tarko

Re: H323 to SIP & vice-versa [ In reply to ]

wsisk at cisco

Jun 23, 2004, 5:25 AM

Post #3 of 4 (2301 views)

Permalink

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
>
>
>
>
>_______________________________________________
>cisco-voip mailing list
>cisco-voip@puck.nether.net
>https://puck.nether.net/mailman/listinfo/cisco-voip
>
>

Re: H323 to SIP & vice-versa [ In reply to ]

wsisk at cisco

Jun 23, 2004, 5:52 AM

Post #4 of 4 (2306 views)

Permalink

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
>>
>>
>>
>>
>> _______________________________________________
>> cisco-voip mailing list
>> cisco-voip@puck.nether.net
>> https://puck.nether.net/mailman/listinfo/cisco-voip
>>
>>
> _______________________________________________
> cisco-voip mailing list
> cisco-voip@puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip