05-23-2012 08:42 AM - edited 03-16-2019 11:18 AM
Hi All,
Working towards me CCIE Voice Lab exam.....
I have 3745 Router with:
1 x NM-HDV
3 x PVDM-12
1 x VWIC-1MFT-E1 Module.
1 x 7960 Phone
I have placed a Loopback cable in the single E1 socket, but I get "RX <- BAD FRAME" received when debug isdn q921 is turned on. So this will not help me simulate a PSTN for me to see Q931 traffic.
Would a single VWIC-2MFT-E1 card be enough to simulate a ISDN q931 and q921 message if I loop the ports together with a E1 crossover and set one as USER and the other NETWORK?
I am trying to go for least cost solution with what I already have?
Thanks,
Ed
Solved! Go to Solution.
05-24-2012 02:11 AM
You need two different routers. You are connecting them back to back. You cant do this on the same router.
You need 1 router acting as PSTN
you need another router acting as the User side
Pls rate useful posts
05-23-2012 08:58 AM
No, you will need 2 ports and connect them via cross-over T1 cable as well as setup one side as ISDN protocol-emulate network.
HTH,
Chris
05-23-2012 09:35 AM
Hi, here are the configuration you need. As chris said you need a cross over E1 cable to connect the two routers back to back.
The pinout for a corss over e1/t1 is as follows:
1 <-> 4
2 <-> 5
4 <-> 1
5 <-> 2
Router 1 (PSTN SIDE)
controller E1 0/2/0
clock source internal (Because its PSTN side, it is the clock provider)
pri-group timeslots 1-31
description E1 Link to Labrouter 2
interface Serial0/2/0:15
no ip address
encapsulation hdlc
isdn switch-type primary-net5
isdn timer T310 120000
isdn protocol-emulate network (****Simulating PSTN SIDE)
isdn incoming-voice voice
no cdp enable
Router 2 (user side)
controller E1 0/1/1
pri-group timeslots 1-31
description E1 Link to Lab PSTN
interface Serial0/1/1:15
no ip address
encapsulation hdlc
isdn switch-type primary-net5
isdn incoming-voice voice
no cdp
05-24-2012 01:51 AM
Thanks guys,
Can I confirm that this can be done on the same route with 1 x 2 port VWIC card?
I understand that I will see both the inbound and outbound q931 messages on the same router.
Thanks,
05-24-2012 02:11 AM
You need two different routers. You are connecting them back to back. You cant do this on the same router.
You need 1 router acting as PSTN
you need another router acting as the User side
Pls rate useful posts
05-24-2012 04:03 AM
Thanks guys.
I'll keep a watch out for another voice router going for cheap than,
05-24-2012 05:52 AM
I suppose teaching people how to fish does not go far these days and step by step instructions are much more appreciated :-(
Chris
05-24-2012 06:21 AM
Chris,
+5 for your inputs. I am actually confused as to how to help people on this forum. Should they be fed completely or should you lead them on the proactive approach. I mean sometimes you post a link to a document and people wont even bother reading it, so I share your thoughts...
05-24-2012 06:46 AM
Thanks, but you did not rate m y post :-)
05-24-2012 07:44 AM
Now I did..I rated the wrong post
05-24-2012 04:15 AM
Surely you can do this on the same router, for studying it will do the job.
Sent from Cisco Technical Support iPhone App
05-24-2012 04:19 AM
Edip,
Chris is right, you can do it on the same router..I got things mixed up. But you need two different ports configured as I explained int he config section
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