VoIP Server Cisco Call Manager

Archived from groups: comp.dcom.voice-over-ip (More info?)

I am curious to the possible configs. If I strictly setup say Cisco
call manager for all calling local, site to site and have the ability
to call to the PSTN, I would have to contact the Telco to get outside
access right? Like my VoIPs gateway would be Sprint or so? I am unclear
as to how it all works still.

Archived from groups: comp.dcom.voice-over-ip (More info?)

"Alistair Cunningham" <ac@gnu.org> wrote in message
newsan.2005.03.03.10.54.09.138239@gnu.org...
> On Wed, 02 Mar 2005 12:14:33 -0800, Lexxus wrote:
>
> > I am curious to the possible configs. If I strictly setup say Cisco
> > call manager for all calling local, site to site and have the ability
> > to call to the PSTN, I would have to contact the Telco to get outside
> > access right? Like my VoIPs gateway would be Sprint or so? I am unclear
> > as to how it all works still.
>
> Lexxus,
>
> There are a number of options for PSTN access. Common ones are:
>
> 1. Normal analogue lines to the telco. Fit FXO VIC cards in your router.
>
> 2. Basic rate ISDN to the telco. Fit BRI VIC cards to your router.
>
> 3. Primary rate ISDN to the telco. Fit PRI VWIC cards to your router.
>
> 4. Find a VoIP provider who will allow you to connect over your internet
> connection using SIP or similar. No cards are needed - the connection is
> made directly from your Call Manager.

5. use the high density gateway cards in a Cat 6k switch - this tends to be
the cheapest way to provide several T1 or E1 interfaces, esp. if you have
the Cat 6k anyway...

public VoIP and / or SIP interfaces may be different, but interworking with
H.323 between Call manager and other PBXes has traditionally been easy in
theory, and painful / difficult / hard to debug in practice....
>
> If you'd like commercial assistance deciding which one, and help
> installing it, email me off group. My company, Integrics Ltd, does VoIP
> consulting.
>
> --
> Alistair Cunningham,
> Integrics Ltd,
> Telephony, Database, Unix consulting worldwide
> +44 (0)7870 699 479
> http://integrics.com/
--
Regards

Stephen Hope - return address needs fewer xxs

Archived from groups: comp.dcom.voice-over-ip (More info?)

"Lexxus" <JBDanford2002@yahoo.com> wrote in message
news:1110144998.062687.273790@l41g2000cwc.googlegroups.com...
> I have a ISDN PRI right now going to my PBX. Would callmanager with a
> PRI card be a good start if I were to go into VoIP? Is there any
> support for existing digital analog lines that are currently in the
> building? Like an adapter card or something?

simplest way is 1 or more cards + DSPs in a cisco router - for just analog
you could use a 1751 / 1760.

if you need just 1 or 2 PRI on T1 or E1 then you need a 2600 or 2800 series.

i havent done the price comparisons recently, but once you get to 4 or more
the Cat 6k cards get to be cheaper.

note that the cards or the rotuer ends up with a bunch of DSPs to handle the
codec functions, so it tends to cost a fair bit more than the base router.

if you go this way then you need to get someone to spec the router for you -
the codecs needed depend on the number of active channels and the codec
processing load. You can also use the DSPs for other jobs in some configs,
such as transcoding or conferencing, so that should be taken into account.

> stephen wrote:
> > "Alistair Cunningham" <ac@gnu.org> wrote in message
> > newsan.2005.03.03.10.54.09.138239@gnu.org...
> > > On Wed, 02 Mar 2005 12:14:33 -0800, Lexxus wrote:
> > >
> > > > I am curious to the possible configs. If I strictly setup say
> Cisco
> > > > call manager for all calling local, site to site and have the
> ability
> > > > to call to the PSTN, I would have to contact the Telco to get
> outside
> > > > access right? Like my VoIPs gateway would be Sprint or so? I am
> unclear
> > > > as to how it all works still.
> > >
> > > Lexxus,
> > >
> > > There are a number of options for PSTN access. Common ones are:
> > >
> > > 1. Normal analogue lines to the telco. Fit FXO VIC cards in your
> router.
> > >
> > > 2. Basic rate ISDN to the telco. Fit BRI VIC cards to your router.
> > >
> > > 3. Primary rate ISDN to the telco. Fit PRI VWIC cards to your
> router.
> > >
> > > 4. Find a VoIP provider who will allow you to connect over your
> internet
> > > connection using SIP or similar. No cards are needed - the
> connection is
> > > made directly from your Call Manager.
> >
> > 5. use the high density gateway cards in a Cat 6k switch - this tends
> to be
> > the cheapest way to provide several T1 or E1 interfaces, esp. if you
> have
> > the Cat 6k anyway...
> >
> > public VoIP and / or SIP interfaces may be different, but
> interworking with
> > H.323 between Call manager and other PBXes has traditionally been
> easy in
> > theory, and painful / difficult / hard to debug in practice....
> > >
> > > If you'd like commercial assistance deciding which one, and help
> > > installing it, email me off group. My company, Integrics Ltd, does
> VoIP
> > > consulting.
> > >
> > > --
> > > Alistair Cunningham,
> > > Integrics Ltd,
> > > Telephony, Database, Unix consulting worldwide
> > > +44 (0)7870 699 479
> > > http://integrics.com/
> > --
> > Regards
> >
> > Stephen Hope - return address needs fewer xxs
--
Regards

Stephen Hope - return address needs fewer xxs