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PSTN<->Router<->CCM5.1<->Sipphone SIP Message 486 Busy missing

Hello

My problem is:

(hope thats the right forum)

On a Third-Pary-Sipphone or 7940-SIP I'll get a 486 SIP Message(Line Busy) calling to intern party that is busy. That's ok..

But if i call to an extern party I'll get only the busy tone.

I'll try to show you the scenario

PSTN(Germany)S2M - router 3745(IOS 12.4(10b)) <-> CCM 5.1 <-> SIPsoftphone/ 7940SIP

On the interface of the router 3745 i can see the cause codes, there is the right cause code, but the CCM? or router sends also inband tones, they where transfered to the phones and not the Sip message

What information is needed for you?

Thanks for help

JanBrugger

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