Ring back level when calling Cisco IP Phone from Siemens ISDN phone

Unanswered Question
Apr 17th, 2008
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Hi people,

I have an issue here,any suggestions?

When calling from Siemens phone to Cisco phone, the "ring back" tone level (before called party is answering the call) is lower than calling from Siemens IP Phone to Siemens IP Phone.

We can't mesure the decibels but seems to be (earing point of view) 50% of the normal Siemens to Siemens call.

I've already changed the "Output Attenuation" in "Product Specific Configuration" of [email protected]

but seems to have no effect.

Here our config :

Siemens optipoint 500 Phone --- Siemens Hipath 4500 PABX --- Q.SIG PRA ---- Cisco 2811 voice gateway --- Cisco Call Manager --- Cisco IP Phone 7940

Our config details :

Product : Cisco 2811

Gateway : [email protected]

Device Protocol: Digital Access PRI

Cisco Callmanager version : 4.1(3)sr1



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kurtdeneef Thu, 04/24/2008 - 06:20
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Not a lot of bug details...but i will check the isdn q931 debug.

So what to do about it then if PI=8?

paolo bevilacqua Thu, 04/24/2008 - 06:27
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Don't bother, it's just a random bug like that poster often does.

What you can do, adjust the output gain a little, under voice port.


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