cisco 3640 cant configure voice-ports

Unanswered Question
May 5th, 2010

I've an cisco 3640 with a VWIC-2MFT-E1 network module. Can anybody tell me why i cant configure any voice-port? without able to configure voice-port, i cant assign any port for my "dial-peer voice xx pots". Anybody has any solution?
what im trying to do is sending voice data traffic to

controller E1 1/0
framing NO-CRC4
clock source line primary
channel-group 0 timeslots 1-31

interface Serial1/0:0
bandwidth 2048
ip address
ip mtu 300
encapsulation ppp
no ip route-cache
no fair-queue
no cdp enable

dial-peer voice 777 pots
destination-pattern 77T
no digit-strip
forward-digits all
I have this problem too.
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forcedgee Wed, 05/05/2010 - 07:38

Thanks for the reply. After reading the data sheet, i got a clearer understanding. It says i need either NM-1FE2W, NM-1FE1R2W, NM-2FE2W to get one serial channel group for my VWIC-2MFT-E1. Am i right? Meaning to say, if i get one of those WIC, im able to create voice ports?

Another question, my 3640 has a WIC which is in used for WAN and a 12 port vlan-switch network module, i understand i need (NM-1FE2W, NM-1FE1R2W, NM-2FE2W) to be able to config voice ports on VWIC-2MFT-E1. Is there any other way to configure to send voice traffic out without voice-port configuration?

Paolo Bevilacqua Wed, 05/05/2010 - 12:45

There is no support for the VWIC-2MFT-E1 on a 3600.  Support is available for the VWIC-2MFT-E1-DI, but with one serial channel group.

That is incorrect. See:

table "Cisco ICS 7750, 36xx, 37xx, and 38xx Platforms Matrix"

In any case, the 3600 is too old for effiencient voip, but use something newer instead.

carunach Wed, 05/05/2010 - 10:10

For E1 PRI voice configuration, we will need to configure "pri-group" under the E1 controller :

Please refer to the following URL :

Please note that 3600 is End of Life :


forcedgee Wed, 05/05/2010 - 19:24

I've only got this from my controller E1


Controller configuration commands:

  channel-group     Specify the timeslots to channel-group mapping for an


  clock             Specify the clock source for a DS1 link

  default           Set a command to its defaults

  description       Controller specific description

  detect            Enable detection of loopback request

  exit              Exit from controller configuration mode

  framing           Specify the type of Framing on a E1 link

  guard-timer       Guard timer (0-20) for xcsp calls - timer duration and

                    accept/reject on expiry

  help              Description of the interactive help system

  line-termination  Specify the line termination for E1

  linecode          Specify the line encoding method for a E1 link

  loopback          Put the entire E1 line into loopback

  mode              Configure the controller mode

  no                Negate a command or set its defaults

  shutdown          Shut down a E1 link (send Blue Alarm)

  tdm-group         Configure DS0 group for TDM

Do i need DSP for the voice-ports? Please guide me on what more module i need to get. Thanks!!;jsessionid=AF45FBC0DDB8636D70F9B526A367016F.node0

carunach Thu, 05/06/2010 - 00:57

Yes, we will need DSP(s) to enable voice functionality.

Please use NM-HDV, VWIC-2MFT-E1 and PVDM modules for E1 PRI in Cisco 3640 :

Also, if this router is for production network please note that Cisco 3640 is End of Life / Support. For production use, please consider ISR (18xx/28xx/38xx) or ISR-G2 (19xx/29xx/39xx).


Leo Laohoo Thu, 05/06/2010 - 15:34

I have no idea with what you are designing or what you are achieving but I can tell you this:  I will never, ever, design  voice/fax systems built around a 3600:  It's too slow for current VoIP and hardware support is very difficult.

Supporting a legacy system would be financially un-sound. 


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