[cisco-voip] Question: Splitting T1 with PRI service (moot)

[Eric Knudson]

Tony,

You''ll still run into the hardware limitation that a vwic-Xmft-t1
will not allow you to configure 'isdn incoming-voice modem' on the
sX/X:23 interface. On a 26XX/28XX/36XX/37XX platform you have to get
the nm-ct1 to handle modem calls. You could alternatively use an
AS5350(or any nextport platform) to handle both types of calls
simultaneously, using DNIS to differentiate between modem and voice
calls.

Regards,

Eric


On Thu, 10 Feb 2005 14:12:37 -0600, Tony Kava <ciscovoip at pottcounty.com> wrote:
> Sorry for replying to myself, but this looks like a moot point.  Our phone
> company definitely can't make two PRI groups across a single T1.  I thought
> this question might be a little absurd, but I was hoping for an answer as to
> whether this is even feasible.
> 
> Thanks.
> 
> --
> Tony Kava
> Senior Network Administrator
> Pottawattamie County, Iowa
> 
> > -----Original Message-----
> > From: Tony Kava [mailto:ciscovoip at pottcounty.com]
> > Sent: Wednesday, February 09, 2005 12:37
> > To: 'cisco-voip at puck.nether.net'
> > Subject: [cisco-voip] Question: Splitting T1 with PRI service
> >
> > Greetings:
> >
> > I have a Cisco 3825 with a VWIC-2MFT-T1 (2-Port RJ-48
> > Multiflex Trunk - T1)
> > with two voice T1 connections (one is PRI).  I also have a
> > NM-6DM digital
> > modem module, and I plan to add another MICA-6MOD to expand
> > to 12 modems
> > total.  After a previous post it was made clear to me that in
> > order to use
> > the digital modems on this platform I would need to use a
> > NM-1CT1 network
> > module for the modem T1.  Had I read cisco.com closer I would
> > have noticed
> > this.
> >
> > I need 12 B channels for our modem calls, but after checking
> > with our phone
> > company I was informed that a fractional T1 from them is actually more
> > expensive than a full T1.  So we'll go with a full T1, and
> > this is the basis
> > of my question.
> >
> > Is it possible for me to split the timeslots on the T1 into
> > two pri-groups
> > (1-13, 14-24 for example) and set Serialx/x/x:12 with 'isdn
> > incoming-voice
> > modem' and Serialx/x/x:23 with 'isdn incoming-voice voice' so
> > that I can use
> > the rest of the T1 for voice calls?
> >
> > I just want to know if I'm way off base here, or if this is
> > common practice.
> > This group was very helpful and surprisingly quick to respond
> > after my last
> > post.
> >
> > Thanks.
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