08-02-2007 11:45 PM - edited 03-03-2019 06:09 PM
Hi all
I am configuring "Drop and Insert" in VWIC2-2MFT-T1/E1 on router 3845.My topo follos: PBX--R3845---Wan(voice and data)---R3845---PBX.
After configuring, Voice and data is OK. I can make a phone call and ping successfully. But Fax and Modem analog do not work. I don't know why?
Please help me.
thank.
08-02-2007 11:58 PM
Hi,
Hi, check out, there is special configuration to make fax/modem work reliably over VoIP, namely fax and modem relay. Just search CCO and begin reading.
Note: this is not really Drop & Insert application.
08-03-2007 05:22 PM
Hi p.bevilacqua.
I think you don't understand my idea. The 3845 Routers are connected to Switchs. I used 15 channels for Voice and 15 channel for Data in WAN link.
Detail about my topo:
PBX---R3845---Wan---R3845--PBX.
..............|..........................|
...........SW.......................SW
I configured Drop and insert in VWIC2 on 3845Routers. One VWIC connects to PBX, the other connects WAN.
Sample configure file in a R3845:
controller E1 0/0/0
framing NO-CRC4
ds0-group 0 timeslots 9-15,25-31 type e&m-wink-start dtmf dnis
tdm-group 1 timeslots 1-8,17-24 type e&m
description Tuyen E1 tra ve Tong dai
!
controller E1 0/0/1
framing NO-CRC4
clock source internal
channel-group 0 timeslots 9-15,25-31
tdm-group 1 timeslots 1-8,17-24 type e&m
description Tuyen E1 di DN
!
connect TDM_to_Data_DN E1 0/0/0 1 E1 0/0/1 1
interface Serial0/0/1:0
description Ket noi den trung tam vung Da Nang
ip address 10.64.253.81 255.255.255.252
!
08-04-2007 03:50 AM
Hi,
Could be a clocking problem, please send "show controllers e1" and check inf PBX and SW wants internal or external clock.
you wiol need "network-clocks-participate" and network-clocks-select" to define how you are using clock in this design. Likely, source from the E1 circuit and give to PBX and switches.
08-05-2007 06:00 PM
Hi p.bevilacqua.
In R3845, The E1 port ,Which connects PBX , is set Clock source internal. The other(to WAN) is set clock source line. I also used "network-clock-participate wic 0" .
I think If clock encounter problem , I can't ping Successfully and make a phone call.
Please,Give me more your ideas about this.
Thanks.
08-06-2007 01:46 AM
well, if the problem with modem and fax happens to on the PBX that are using VoIP, as I said initially you must do special configuration, T.38 for tax, and modem realy for modem. In any case, check "show controller e1" for slips.
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