VWIC-2MFT-E1 vs 2xVWIC-MFT-E1. Troubles. Please help

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Aug 17th, 2009
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I wanted to save one slot in my 2621XM - this is one of main reasons I have bought VWIC-2MFT-E1 instead of 2 one-head controllers. Also I installed 1 AIM-VOICE30. (I need 2 e1 PRIs with only 16 timeslots in each)

I have 2 E1 links, first - from my telephony service provider and second link from my PBX (AVAYA). So i see my future scheme this way:

controller e1 0/0

description - To Service Provider.

pri-group timeslots 1-16

!

controller e1 0/1

description - To PBX

pri-group timeslots 1-16


I want a call arrived from SP will be sent to PBX and a call arrived from PBX well be sent to SP.


But I can not configure times slots on second e1, just see the output...


GK(config)#controller e1 0/0

GK(config-controller)#pri-group timeslots 1-16

GK(config-controller)#

Aug 17 18:55:49.327: %LINK-3-UPDOWN: Interface ISDN-VOICE 0/0:15(1), changed state to up

GK(config-controller)#

Aug 17 18:55:49.339: %LINK-3-UPDOWN: Interface ISDN-VOICE 0/0:15(15), changed state to up

Aug 17 18:55:50.011: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:0, changed state to down

Aug 17 18:55:50.019: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:1, changed state to down

Aug 17 18:55:50.027: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:2, changed state to down

Aug 17 18:55:50.035: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:3, changed state to down

Aug 17 18:55:50.043: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:4, changed state to down

Aug 17 18:55:50.051: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:5, changed state to down

Aug 17 18:55:50.059: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:6, changed state to down

Aug 17 18:55:50.071: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:7, changed state to down

Aug 17 18:55:50.087: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:9, changed state to down

Aug 17 18:55:50.095: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:10, changed state to down

GK(config-controller)#

Aug 17 18:55:50.103: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:11, changed state to down

Aug 17 18:55:50.111: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:12, changed state to down

Aug 17 18:55:50.119: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:13, changed state to down

Aug 17 18:55:50.131: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:14, changed state to down

Aug 17 18:55:50.235: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:8, changed state to down

GK(config-controller)#

Aug 17 18:55:51.147: %LINK-3-UPDOWN: Interface Serial0/0:15, changed state to down

Aug 17 18:55:52.147: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0:15, changed state to down

GK(config-controller)#exit

GK(config)#controller e1 0/1

GK(config-controller)#pri-group timeslots 1-16

% Not enough DSP resources available to configure pri-group on controller E1 0/1

% The remaining dsp resources are enough for 17 time slots.

% For current codec complexity, 0 extra dsp(s) are required to create this voice port.

% Not all config may be removed and may reappear after reactivating the logical-interface/sub-interfaces

repeated many times.

Can somebody help?


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paolo bevilacqua Mon, 08/17/2009 - 07:28
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Which exact IOS are you using ?

paolo bevilacqua Mon, 08/17/2009 - 07:45
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That is recent, chances are is some bug, but unlikely cisco will ever fix that, because the platform is obsolete.

paolo bevilacqua Mon, 08/17/2009 - 07:48
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That is my opinion, I don't know what Cisco would say, quite possibly two PRIs off a single AIM-DSP is not supported.

paolo bevilacqua Mon, 08/17/2009 - 07:53
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If you want to be sure it works, get a minimum of a 2801 with PVDM2-32.

SludnevTN_2 Mon, 08/17/2009 - 08:07
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Tomorrow I will insert there another vwic-1mft-e1. so i will have to separate e1 controllers...time wil show. Thank you.

And another question:

I am a bit confused. I will have 2 e1 links, 1 - To SP, 2 - To PBX and is it possible to transfer calls from 1 e1 to second e1 and opposite direction. Is it possible to have 2 pots peers on different sides of one call? Have somebody done this? May you will help with sample config?

paolo bevilacqua Mon, 08/17/2009 - 09:42
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I don't think it will work with a separate card, apparently the AIM wants to service to a single interface only.


Having two ports is a common configuration. PBX numbers point into a DP, PSTN number into another. Since router intercepts all calls, you can do VoIP as you like.


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SludnevTN_2 Tue, 08/18/2009 - 07:23
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Yes, you were right - 2621XM + AIM-VOICE30 does not work right way neither VWIC-2MFT-E1 nor 2xVWIC-1MFT-E1. 2811 + PVDM2-32 + VWIC-2MFT-E1 - works the way I want. It gives me 2 PRIs with 16 active timeslots.

Thank you.

May be you will help me with real working config.

I want first PRI is looking at SP. Second PRI is looking at PBX.

I am confused with one fact, let me explain:

1. User dials a city number (inside BPX)

2. PBX forwards digits to GW via PRI.

3. GW sees that the city number must be forwarded to POTS peer - PRI from SP. So the call came from POTS peer and must be forwarded to POTS peer. Is it possible?

Is it possible to have 2 POTS peers in one call?

paolo bevilacqua Tue, 08/18/2009 - 07:29
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I think the AIM-DSP can't work because it cannot split a single DSP across two ports. So it may work with with, eg 10 channels per PRI.


Yes as mentioned above you can have calls that are terminated on pots both sides. This is useful when you are unable to program the PBX so you put the router between PBX and PSTN.


Just leave port that goes to PSTN as default, configure network-side and internal clock on the port that goes to PBX.

SludnevTN_2 Tue, 08/18/2009 - 07:39
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Don't you mind if I will show you my config?

Also, at this moment network-clock-participate and network-clock-participate-select is not 100% clear to me... why - i was working about 2 years without them. I do not understand the real effect of them...

I want you to confirm that everything is correct and perfect.

paolo bevilacqua Tue, 08/18/2009 - 07:48
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May be you was not doing fax that's why you did not noticed problems.


Set network-clock-select to the PSTN port, there is nothing else to worry about.


SludnevTN_2 Tue, 08/18/2009 - 08:03
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Please confirm my correct understanding of the commands:

network-clock-participate wic 0 - this tells IOS that Controller in slot "HWIC0" will be watching for synchronization


network-clock-select 1 E1 0/0/0 - this points IOS to watch for synchronization in the exact "head" - 0.

!

controller E1 0/0/0 ! This head will TAKE synchronization from SP

framing NO-CRC4

pri-group timeslots 1-16

description SP PRI

clock source line ! hidden

!

controller E1 0/0/1 ! This head will GIVE synchronization PBX

framing NO-CRC4

pri-group timeslots 1-16

description PBX PRI

clock source internal

!

interface Serial0/0/0:15 - SP Serial

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn incoming-voice voice

no cdp enable

!

interface Serial0/0/1:15 - PBX Serial

isdn protocol-emulate network !!! Is this necessary?

no ip address

encapsulation hdlc

isdn switch-type primary-net5

isdn incoming-voice voice

no cdp enable


Am I correct?


paolo bevilacqua Tue, 08/18/2009 - 08:06
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Yes, I told you the principles before, it's not always necessary to go over configuration.

SludnevTN_2 Tue, 08/18/2009 - 08:16
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Yes, I told you the principles before, it's not always necessary to go over configuration. - I am sorry, I really do not understand what this means... Does it means that the principle is - Answer the questions and never give a config?

SludnevTN_2 Tue, 08/18/2009 - 17:53
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Thank you anyway. Your answers were really helpful and very quick.

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