I have a 3300 CXi with analog trunks and wish to introduce the call extension to mobile phone feature. It is not cost effective to use the analog trunks because of the high tariff on leased lines or practical to use becuase of the distance to the PSTN. Are there any other solutions that one can consider for example a Fixed Cellular terminal or can one use IP trunking to connect the CXi directly to the Mobile service provider's switch. Is the APC still required ??