[cisco-voip] back to back pri

[Stu Packett]

Kevin:
If I only had one VG200, could I just purchase a VWIC-2MFT-T1 (2-port T1
VWIC) and use a crossover cable between the two ports to simulate a
telco along with using the commands you mentioned below?

My goal is to just use one VG200 instead of two VG200s in my lab.

Thanks. 

-----Original Message-----
From: Kevin Thorngren [mailto:kthorngr at cisco.com] 
Sent: Monday, May 08, 2006 4:48 AM
To: Stu Packett
Cc: cisco-voip at puck.nether.net; mohammad mirzaee
Subject: Re: [cisco-voip] back to back pri

Hi Stu,

Yes, configuring back to back PRI like this makes a perfect PSTN 
simulator.  With the VG200 you can use the CCM to terminate the PSTN 
calls.  Just add one or more IP Phones that will be your PSTN phones to 
the CCM.  Place them in a new partition.  Add the VG200 as an H.323 GW 
(you could use MGCP) and give it a CSS that contains only the new PSTN 
partition.  This way you can make either inbound or outbound PSTN 
calls.

This configuration works will but one thing to note is that you will 
see both the sides of the call setup in the CCM traces.  Although this 
is not a problem it could be confusing :-)

Kevin
On May 8, 2006, at 12:28 AM, Stu Packett wrote:

> Kevin:
> This seems to be a perfect setup for a telco simulator.  Would you
know
> what other commands to type in on both routers to make this a working
> telco simulator?  I have several VG200s sitting around with ISDN PRI
> cards and I hope to use them as a telco simulator so my lab could make
> some 'outside' calls instead of the regular 'internal' calls I'm
> currently only able to make.
>
> Thanks in advance.
>
> -----Original Message-----
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Kevin 
> Thorngren
> Sent: Sunday, May 07, 2006 6:54 PM
> To: mohammad mirzaee
> Cc: cisco-voip at puck.nether.net
> Subject: Re: [cisco-voip] back to back pri
>
> You will need to do the following....
>
> - T1 crossover cable
> - One side should provide clocking by using the "clock source
internal"
> on the T1/E1 ocntroller
> - One side will need to be the ISDN User Side (default) and you will
> need to configure the other side as the ISDN Network Side with the
> following command under the serial interface: "isdn protocol-emulate
> network"
>
> For example:
>
> controller T1 3/0
>   framing esf
>   clock source internal
>   linecode b8zs
>   pri-group timeslots 1-24
>
> interface Serial3/0:23
>   no ip address
>   encapsulation hdlc
>   isdn switch-type primary-ni
>   isdn protocol-emulate network
>   isdn incoming-voice voice
>   no cdp enable
>
> Kevin
>