We have a Viking Emergency call station that is setup with SIP as it is IP based.

The unit is able to make calls to my extension but when you try and call it, my Toshiba phone shows "Extension Vacant"

The Viking unit shows as registered to the SIP server and the Toshiba show on the MIPU16 that it is idle and show IP address.

Viking says it is the Codec that Toshiba is using.

I have it set to G711 on the CIX and G711u on the Viking device.

Has anyone else ever experienced this?

Thanks.