[cisco-voip] Modem PassThrough

[Scott Voll]

only thing I can think is *maybe* there's a difference between Alaw and
Ulaw.  other then that..... I don't know.

Scott

On Jan 14, 2008 12:41 AM, Ramiz Sardar <ramizchaudhary at gmail.com> wrote:

>  Friends,
>
> I configured routers with for modem passthrough. When my modem dial RAS
> number, It starts negotiation with RAS but keep negotiate and not connected.
> Means repeat negotiation again and again till timeout. Once it surprisingly
> connected but within 30 sec it disconnected. Network Topology below:
>
>
> RAS--------PBX-----Rt-A--------------------Rt-B----PBX-----------DialupUser
>
> And Configuration below:
>
> hostname Rt-B
>
> isdn switch-type primary-qsig
>
> voice service voip
>  modem passthrough nse codec g711alaw
>
>
>
> controller E1 0/0/0
>  channel-group 0 timeslots 1-31
>
> controller E1 0/1/0
>  pri-group timeslots 1-31
>
> interface Serial0/0/0:0
>  ip address 10.0.0.2 255.255.255.252
>
> interface Serial0/1/0:15
>  no ip address
>  encapsulation hdlc
>  isdn switch-type primary-qsig
>  isdn overlap-receiving
>  isdn incoming-voice voice
>  isdn bchan-number-order ascending
>  no cdp enable
>
> router ospf 100
> network 0.0.0.0 255.255.255.255 area 0
>
> dial-peer voice 786 voip
>   destination-pattern 786$
>   modem passthrough nse codec g711alaw
>  session target ipv4:10.0.0.1
>  no vad
> !
> dial-peer voice 785 pots
>  incoming called-number 786$
>  direct-inward-dial
>  port 0/1/0:15
>
>
> -------- Router A ---------
>
>  hostname Rt-A
> isdn switch-type primary-qsig
> !
>
> voice service voip
>  modem passthrough nse codec g711alaw
> !
> controller E1 0/0/0
>  channel-group 0 timeslots 1-31
>
> controller E1 0/1/0
>  pri-group timeslots 1-31
>
> interface Serial0/0/0:0
>  ip address 10.0.0.1 255.255.255.252
>
> router ospf 100
>  network 0.0.0.0 255.255.255.255 area 0
>
> dial-peer voice 786 pots
>  destination-pattern 786$
>  direct-inward-dial
>  port 0/1/0:15
>  forward-digits 3
> !
> dial-peer voice 785 voip
>  modem passthrough nse codec g711alaw
>  incoming called-number 786$
>  no vad
>
> Waiting for your immediate response.......
>
> Best Regards
>
>
> On Jan 9, 2008 9:42 PM, Scott Voll <svoll.voip at gmail.com> wrote:
>
> > Modem pass through is just like Fax passthrough.  both need to run over
> > a G711 codec.
> >
> > config is pretty simple.  just add the following commands:
> >
> > H323 looks like this:
> >  voice service voip
> >  h323
> >  modem passthrough nse codec g711ulaw
> >
> > Also make sure you have VAD turned off on the dial peer(s)
> >
> > MGCP looks like this:
> >
> > mgcp modem passthrough voip mode nse
> >
> > Scott
> >
> >
> >   On Jan 9, 2008 7:15 AM, Ramiz Sardar <ramizchaudhary at gmail.com> wrote:
> >
> > >  Friends,
> > >
> > > I am currently working on voip setup. With the existing tdm network,
> > > dialup users from different sites dial Remote Access Server in central site.
> > > When i will put routers into that network, can users be able to connect
> > > again via voip setup. Topology includes cisco 3800 routers that connect with
> > > Ericson MD110 pbx through E1 (Pri Qsig). Routers are connected point to
> > > point through E1. RAS is non-cisco.
> > >
> > > Existing Topology:
> > >
> > > IP Network
> > > ---------RAS------------PBX--------------------------------------------PBX--------------Dialup
> > > User (Modem)
> > >
> > > Topology after voip setup:
> > >
> > > IP Network
> > > ---------RAS------------PBX---------Router-----------------------------Router--------PBX--------------Dialup
> > > User (Modem)
> > >
> > > With some study i come to know that there is concept of modem
> > > passthrough that can be used but someone please explain it briefly. And if
> > > someone currently using it, please write down a sample configuration
> > > according to my voip topology.
> > >
> > > Best Regards
> > >
> > > _______________________________________________
> > > cisco-voip mailing list
> > > cisco-voip at puck.nether.net
> > > https://puck.nether.net/mailman/listinfo/cisco-voip
> > >
> >
> >
>
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