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Add digital lines in E1 for voice

Level 1
Level 1

Hi Team

I have a router that receive the E1, I did had 20 digital lines, but now are increased at 30 digital lines, I need configure the controller E1 for receive the 30 digital lines. I´m trying to configure this but I see errors in the CLI:

1.- voice-port 0/0/0:0

        no shut

2.-controller E1 0/0/0:0

       ds0-group 0 timeslots 1-15,17-31 type r2-digital r2-compelled ani  -> no accept this command because the voice-port no exist

from here I can not advance,I do not know what commands missing.

Thank you for response.


9 Replies 9

Cisco Employee
Cisco Employee


Is that the exact error the router is giving you?

Can you attach the following show commands?

show run

show ver

show inv

Also what was the exact commands you followed to make the change?

~ Luis Ramirez,


Here is a basic template to configure an E1:

network-clock-participate wic 0

network-clock-select 1 E1 0/0/0

isdn switch-type primary-net

controller E1 0/0/0

pri-group timeslots 1-31

interface Serial0/0/0:15

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn overlap-receiving

isdn incoming-voice voice

no cdp enable

voice-port 0/0/0:15

cptone (your country)

Best Regards

Or is this what your are trying to achieve?

controller E1 0

clock source line primary

ds0-group 0 timeslots 1-15,17-31 type r2-digital r2-compelled

cas-custom 0

voice-port 0:0

compand-type a-law

Best Regards

Hi Yesenia

First shut the proeviously created voice port.

Remove the actual controller configuration

Configure the controller as follows:

controller e1 0/0/0

pri-group timeslot 1-31

voice-port 0/0/0:15

cptone ??

bearer-cap speech




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Nadeem Ahmed
Cisco Employee
Cisco Employee

Try this

controller e1 0/0


voice-port 0/0:15


controller e1 0/0

no dsp-group 0

dsp-group 0 timeslots 1-15,17-31


Please rate all useful post.

Br, Nadeem Please rate all useful post.

Hello, thanks for your responses  helped me very much.

I have the commands and errors completes:

When I enter the command:

ds0-group 0 timeslots 1-15,17-25 type r2-digital r2-compelled ani into the controller e1, I receive this error:

% Not enough DSP resources available to configure ds0-group 0 on controller E1 0/0/0

% The remaining dsp resources are enough for 20 time slots.

% For current codec complexity, 1 extra dsp(s) are required to create this voiceport.

This the inventory in the router:

GW-VOSS(config-controller)#do sh inv

NAME: "2821 chassis", DESCR: "2821 chassis" PID: CISCO2821         , VID: V05 , SN: FTX1336AHFS

NAME: "VWIC2-1MFT-T1/E1 - 1-Port RJ-48 Multiflex Trunk - T1/E1 on Slot 0 SubSlot 0", DESCR: "VWIC2-1MFT-T1/E1 - 1-Port RJ-48 Multiflex Trunk - T1/E1"  PID: VWIC2-1MFT-T1/E1  , VID: V01 , SN: FOC133129NF

NAME: "2nd generation two port FXO voice interface daughtercard on Slot 0 SubSlot 1", DESCR: "2nd generation two port FXO voice interface daughtercard"PID: VIC2-2FXO         , VID: V02 , SN: FOC13332NDZ

NAME: "3rd generation two port FXS DID voice interface daughtercard on Slot 0 SubSlot 2", DESCR: "3rd generation two port FXS DID voice interface daughtercard" PID: VIC3-2FXS/DID     , VID: V01 , SN: FOC132526S0

NAME: "PVDMII DSP SIMM with four DSPs on Slot 0 SubSlot 4", DESCR: "PVDMII DSP S IMM with four DSPs" PID: PVDM2-64          , VID: V01 , SN: FOC13341ZE1.

I  have the transcoding:

dspfarm profile 1 transcode 

codec g711ulaw

codec g711alaw

codec g729ar8

codec g729abr8

codec g729r8

codec g729br8

maximum sessions 15

associate application SCCP

I have CUCM 7.0, Contac Center 6.0, SIP trunk, 1 E1.

I need another PVDM card? The router can be have two PVDM card? Which PVDM card you recommend ?



Please change the maximum session from transcoding to little lesser value.

may be maximum session 12 and try the command which you trying it won't be giving the error.

you can try to remove from connference if you have that also.

you need to down the controller, serial interface for controling (signalling) and then voice port.

try no dso-group and try dso-group with required channels.

hope this help.

Also is it controller e1 or t1?




You are right, the PVDM2-64 is not enough for that setup.

You currently have a transcoder doing using a lot of resources.

You'll need at least another PVDM2-48 to have the full E1 or lower the sessions on the transcoder.

Here you have a link with a DSP calculatior you can use, but would suggest you to contact your sales engineer so they can recomend you what's best fpr your network.

~ Luis Ramirez,

I would recommend you to configure the E1 with 30 channels before you create the dspfarm for the XCODER. Also remove all codecs with a "b" in the name from any dspfarm. B is equal to VAD and a popular saying is VAD is BAD. If you don't need VAD, in most cases it's not used, then I would recommend you to remove these codecs. This will also lower the over all complexity for the codecs, this requires less DSP resources.

When you have setup the E1 with 30 channels and removed all codecs with a "b" in the name you can do a max session ? under the dspfarm to see how many sessions you can support for the XCODER. If you don't get enough sessions you will have to add more DSPs.

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