MLAA tone detction problem

[Jakt99]

Hi All,

Have a odd and irritating fault.

I have virtual MCD setup (11.0.2.66 / MCD 5.0 pr2 sp2) running sip trunks. the main DID number answer point is a MLAA front end with 4 dialling options transferring to acd paths.

The customer is complaining that interstate callers when dialling option 1, 2, 3 or 4 occasionly hear from the the MLAA auto attendant that the dialed option is unknown or valid (I can't remmember the exact message!!) and no matter how times they try after that the MLAA wont interpret dtmf and transfer them out.

The ACD paths are setup to take calls even if agents are logged out (path unavailable goes to one 5320 handset with voicemail mail enabled behind it)

When I test locally (many, many calls) from either a pstn line, cell/mobile phone, my office phone or a system office phone I cannot replicate the fault. I have even resorted to getting my staff members to make test calls when the fault is reported and they cannot replicate the fault either.

My initial thought is dtmf distortion of some sorts through the sip trunk caused from the source network.

Any ideas where to start. Am at a loss and the client is bitterly complaining.

 

[LoopyLou]

the key is that interstate callers are having the issue. Would think its a SIP carrier issue but it will be difficult to troublshoot.

I'd tell you a UDP joke but I'm afraid you won't get it. TCP jokes are the best because you always get them.

 

[Jakt99]

Thanks LoopyLou

Thats what I reckon too. My Challenge is how to convince the client. Its a green field site, brand new set up.

 

[kwbMitel]

It's the occasionally that gets me on this. My gut reaction is that the callers are on cell phones that do not send tones of long enough duration.

That being said, SIP trunking is still in its growth phase and anything goes

**********************************************
What's most important is that you realise ... There is no spoon.

 

[LoopyLou]

Amother good point we have had lots of issues with tone and they all pretty much have traced back to cellular users.

I'd tell you a UDP joke but I'm afraid you won't get it. TCP jokes are the best because you always get them.

 

[danramirez]

Jakt, are you using MBG in your configuration?

I had a similar problem with a customer in the past, they had 5 SIP channels from Skype and sometimes DTMFs worked and other times didn´t.

When I reported it to the support guys (Mitel) they advised me to use MBG as SIP Proxy. After introducing the MBG all dtmfs issues were resolved.

Not a cheap thing to try... we now always install MBGs where SIP Trunks are present

Regards,

Daniel

http://www.hatkana.com

http://www.wtelecom.com

 

[Jakt99]

Thanks All,

Tis really hit a miss and i doesn't matter if the call generated by cell phone or land line.

As KwbMitel pointed out its sip after all........Hit and miss

Danramiez
Good throught with MBG, the answer is no unfortunately. I don't know if I can put in a proxy server, will have to liaise with there IT dept.