/mcpDescription Restriction The system does not support the Cisco VG248 Gateway which does not have a Call Classification field. Cisco VG248 Gateway Cisco Unified Communications Manager considers all Cisco Unified IP Phones and FXS ports as OnNet (internal) that cannot be configured as OffNet (external). FXS Ports Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 513 Receiving Calls External Call Transfer Restrictions Restrictions