GRP260x – Virtual Extension User Guide Introduction Grandstream’s GRP260x series introduces an innovative “Virtual Extension” feature, enabling users to establish additional virtual extension associated with their...
GRP26xx – VPK (Virtual Multi-Purpose Keys) Guide Grandstream GRP26XX Carrier-Grade IP phones support the VPK (“Virtual Multi-Purpose Keys”) feature to add more flexibility and provide better user...
GRP Series – BLF Guide Busy Lamp Field (BLF) feature allows an end user, such as attendant, to monitor the hook status of a list...
GRP Series – Eventlist BLF Guide Although SIP protocol (RFC3261) was not providing the semantics to support the Busy Lamp Field (BLF) but there’s a way...
