[cisco-voip] Modem PassThrough

Mon Jan 14 16:45:08 EST 2008

Thanks Jason. But i am doing this trail in test lab and both pbx and routers
are in same room....no media issue at all.... :-(

Best Regards

On Jan 14, 2008 9:26 PM, Jason Aarons (US) <jason.aarons at us.didata.com>
wrote:

>  Show controller e1, any clock slips anywhere ? Any noisy lines?
>
>
>
> Ask teleco to check their ends and run tests.
>
>
>
> *From:* cisco-voip-bounces at puck.nether.net [mailto:
> cisco-voip-bounces at puck.nether.net] *On Behalf Of *Ramiz Sardar
> *Sent:* Monday, January 14, 2008 11:20 AM
> *To:* cisco-voip
> *Subject:* Re: [cisco-voip] Modem PassThrough
>
>
>
> 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
>
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