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Heath Deschenes
Enthusiast

VG224 MGCP vs. SCCP

Hello all,

I have always used MGCP when configuring my gateways with PRI's. I am looking for some advice on whether to use MGCP or SCCP on 8 VG224s I am installing. I have seen some posts in the forums that SCCP has more features, but I could not find any documents that compare the features.

I would be happy to hear your opinions on what you are using and why or any links to side by side comparisons.

In the end, unless SCCP has a substantial amount of features over MGCP, I would probably stick to MGCP.

Thank you,

Heath

20 REPLIES 20
dc-csa-north
Beginner

Hi,

The best of the two options would be mgcp,i have been using mgcp with vg224 for last of my two clients.

dc

If the VG350 has mix of both FXS Fax and Phones, do we have a choice to use both MGCP and SCCP in a single gateway based on ports?

I'm trying to save CUCM user licensing cost with MGCP; however, some phones will require SCCP based features (

Audible MWI, Call Transfer, Call Waiting, Distinctive Ring, Feature Access Codes, Speed Dial, etc).

Here's the list of SCCP FXS features:

http://www.cisco.com/en/US/docs/ios/voice/fxs/configuration/guide/fxshist.html

There's a lot of things you can do with SCCP that you can't with MGCP. Park, pickup, hold, transfer, conference, etc. Almost everything you can do with an IP phone you can do using codes on the phone. You use hookflash for holds/transfers and then dial things like **7 to use a certain feature.

-nick

Great post Nick. Question for you... My customer is has a mix of uses for the VG224s we are going to install. Primarily, it will be setup with this:

7945 phone Line 1 x4000

VG224 Port 1 x4000

So basically it is a shared line between the analog port and the IP phone. The thought is that the client could plug in an analog phone and be able to answer either their IP phone or the analog set. But what throws a wrench is that, it is possible that the analog be used for faxing instead or also for the analog phone.

Would SCCP be better or MGCP?

Thanks much!

Hi Tommer,

This depends. I would say SCCP is probably better at handling shared lines than MGCP, but MGCP will have greater faxing capability.

If you are forced to do IP faxing to a 3rd party device in your network or SIP trunk, I would go with MGCP. If you know that every time you're going to fax to a Cisco device on the other end of the IP leg, go with SCCP and configure modem passthrough.

-nick

Thanks Nick. I saw that SCCP does T.38 so that should be ok correct? The provider has some soft switch on the backend, but my PRIs are mgcp off 2851 coming in. So it would be MGCP at the gateway, then SCCP at the VG224.

I agree with the SCCP and the shared lines. They will probably have around 10 fax machines, but who knows. It's a residential complex. So a resident could in theory, plug in a fax machine instead of an analog phone.

lfulgenzi
Rising star

It all depends what you're using the gateways for. If it's primarily analog phones, go with SCCP. When you configure FAX/modem passthrough, even modems and faxes will work without too many issues.

The big thing is contact enabled alarms. This needs MGCP as far as I know, otherwise you lose the location information of the alarm.

In that case, buy a vg202/4 for the few alarms you have or a separate vg224 for alarms only and config that as MGCP.

Thank you all for your responses. I am going to be using this primarily for fax and modems. I was looking into using SCCP so I could still use conferencing on our Analog Polycom units, but it looks like even SCCP has a 3 party limit unless using meet-me conferencing (which we use conf. services for this type of conf.) I am going to go ahead and use MGCP and replace the Polycom units with 7936's

Thanks again,

Heath

for the fax via sip trunk and so  we have use MGCP , but some feature we have use SCCP .

my question is can we use MGCP and SCCP on the same VG224 ?

Is it working this way ?

thanks

Yes as long as you're not trying to control the same port with both protocols.

How can you configure a protocol on a port different than that of the gateway.  The port comes up with the default protocol set for the gateway.  I would like to configure an mgc port on a VG224 set up with SCCP protocol.

Yeah (just to clarify for others here) you want to keep your fax machines off of SCCP if you have a SIP trunk to an ITSP.  That will be protocol-based switchover, which a SCCP port cannot do, but MGCP, H323, SIP endpoints are able to.

Steve, I was in RTP last week and you weren't there!  Hey, interesting comment on not using SCCP if you are using SIP Trunks to the provider.  I'm running SCCP VG224s with CUCM 6, with SIP Trunks into my ISR G1 and G2s and then ISDN PRIs out to the PSTN with no issue.  (We are using SIP due to CVP).  How have you experienced problems with this?

Hey Jeremy,

Yeah, I was away for Thanksgiving last week.

The reason I don't recommend SCCP on VGs if a SIP ITSP is being used is for faxing.  The SCCP controlled endpoints only can switchover with NSEs, and providers need to see a protocol-based switchover.  With MGCP/SIP/H323, the VG can use a protocol-based switchover to trigger a SIP re-INVITE for 711 or T.38 to the provider.

If you're just using the VGs for voice, or don't fax out the SIP ITSP, feel free to use SCCP on the VGs.

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