[Linphone-users] Call failed to certain numbers

[Andi Soko]

Hey guys,

I have linphone installed and using the a SIP line from peoplephone.at.

I mainly call customers in Germany and when I call their official/main  
number "+4935...9926" everything works.
But when I call an extension-number to get to a specific person  
(+4935...9915) I get the following error:

Call failed
Cannot call + +4935...9915
Reason was: Not Acceptable Here
[Media Descriptions Syntax error while parsing the SDP]


When I use another SIP client app (i.e. Zioper) with the same SIP line all  
numbers are working. But I like linphone interface and would like to use  
it :)

can anyone give me some hints were to look at or which option to change?

thanks
Soko