[cisco-voip] Modem PassThrough

[Ramiz Sardar]

Thanks for reply. Alaw is used for E1 so this shouldn't be an issue. Anyone
else have idea, please help me.............

Waiting....
Best Regards

On Jan 14, 2008 8:58 PM, Scott Voll <svoll.voip at gmail.com> wrote:

> 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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