Problem about calling

Unanswered Question
Jun 16th, 2007

when the phone off hook,some time no dial tone and when conversation,the call drop.

We use cisco iad 2430 to connect phone or pbx.

Please help me.

Sorry about my English not good

I have this problem too.
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kyipcom84 Sat, 06/16/2007 - 07:40

I'm using IOS Version 12.3(11)T3 and boot system from flash

name IOS:c2430-i6s-mz.123-11.T3.bin

Paolo Bevilacqua Sat, 06/23/2007 - 03:02


It would be probably illegal for me to give access to IOS software. Please contact your cisco reseller and buy a smartnet contract for your device, this will give you access to all downloads, hardware warannty, and TAC support.

kyipcom84 Sat, 06/23/2007 - 07:49

OK,I'm so sorry about it.I'll contract to Cisco Reseller.I'll try fix it,hope successful

Paolo Bevilacqua Sat, 06/23/2007 - 08:57

No worries. If your reseller is unable to help you, contact me at the email that is in my profile, and we can prepare an offer for smartnet as we are an official cisco reseller.

kyipcom84 Sun, 06/24/2007 - 02:36

Hi p.bevilacqua

Can you tell me some debug command when call and fax problem in IAD.

Thanks a lot

kyipcom84 Sun, 06/24/2007 - 18:49

Hi p.bevilacqua

In last post,you recommand to upgrade IOS Ver12.4(13),then I contact my reseller,they download for me IOS ver 12.4(16) and thay said it a newish IOS Ver of Cisco.Than I want to know this ver it ok for my devices?


kyipcom84 Mon, 06/25/2007 - 09:06

somebody said that,Cisco's IOS had two type,one is IOS plus and one is IOS (T) example:c2430-i6s-mz.123-11.T3.bin

could you explain How can I distinguish IOS Plus and IOS (T),and what should I choose IOS for my system,use for Voice (VoIP)


Paolo Bevilacqua Mon, 06/25/2007 - 13:46


IOS "plus" doesn't exist anymore for new versions. The T train is instead to deliver new features, but in you case you should be fine with 12.4(16) non-T.

As a recognition to those providing answers, please rate all useful posts using the scrollbox below!

kyipcom84 Wed, 06/27/2007 - 06:17

Hi p.bevilacqua

I had upgrade the new IOS ver 12.4(16) but it still problem.

Please give me a advice for my system,

this is a picture of my network

analog phone --->Cisco IAD 2430 --->MPLS Network---->Cisco As5400 ---->PSTN.

Problem occur in analog phone to connect Cisco IAD 2430

Paolo Bevilacqua Wed, 06/27/2007 - 09:02

Does it happen all the time or just sometime ?

How much traffic are you sending over the mpls network ?

Can you keep a continuous ping and check that there is no loss of connectivity when the call drops ?

Paolo Bevilacqua Fri, 06/29/2007 - 03:35


Do you use CCM with MGCP? Which exact version of CCM? Can you send a diagram of the whole voice network ?

Also you said you upgraded do 12.4(16), but in the attachment we read:

version 12.3

please take the show version and show run again.

kyipcom84 Fri, 06/29/2007 - 19:44

I did not use CCM with MGCP,I use BroadWork.

When I upgraded to Ver 12.4(16),problem with all my phone.when conversation,I speak but in here did not hear any thing,then I restored old version 12.3

I'll give u a topology of voice network and show run of ver 12.4(16)


Paolo Bevilacqua Sat, 06/30/2007 - 05:06


With MGCP, in all honesty I'm unable to help you further. It is possible that there are settings needed to make the IAD to work with broadwork, but I wouldn't know which ones.

The fact that you had no voice when upgrading to 12.4(16) may be due to the need of such specialized settings.

At this point, you may ask the TAC to help you (need a support contract) or ask again into the "ip telephony forum" for a problem with MGCP broadwork. In both cases you will be required to provide MGCP traces.

good luck!


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