Paralellcall does not work at all extensions

Hallo,

we have the config as follows:

extensions 102, 108 and 105, 107 are ringing in the same time. The same should be also be at 103 and 106. They work however not.

Do you have any idea what the reason can be?

One reason can be that 102,103 and 105 are logged in - as DECT VoIP - thru an AVM 7270 Fon. 108 und 107 are accessed thru Snom M9.

The problem could be caused by the AVM-Device blocking if two VoIP-Calls are given in the same time.

Do somebody has an idea to solve the problem.

Could IP-Tel check if the system is OK anyway?

Thank you.

Regards,

P.