Trunk Telephony & Video

A PBX connects the telephony endpoints of a business and manages internal and external call handling. It handles extension traffic, trunk traffic, call control, voice prompts and, in modern systems, IP-based call handling, digital trunk integration and mobile extension support.

CTSer designs, implements and maintains enterprise telephony: analogue systems, digital systems, IP-PBX systems, hybrid systems and distributed group telephony where branch extensions are dialled directly across sites.

Our scope: technical cooperation with the major PBX manufacturers and on-site engineering; and integration with our structured cabling and network design so that voice and data are delivered as one solution rather than two projects.

Trunks in common use: ordinary exchange lines; ISDN lines; analogue and digital trunks with automatic route selection; and dedicated inter-site links for multi-branch telephony.

Extensions in common use: ordinary analogue extensions; proprietary digital extensions; and IP extensions registered to an IP-PBX over the data network.

What a PBX actually buys you: every employee has an extension and the front desk or auto-attendant routes incoming calls, so callers reach the right person quickly and calls can be transferred again internally. If an extension is busy or unanswered, the system diverts the call to another extension or to a voicemail box instead of losing the caller. Extension-level call accounting shows what each extension spent, which numbers were dialled and the total, and PIN codes stop unauthorised use of a desk phone.

Video conferencing — a typical deployment comprises an MCU, room endpoints, desktop clients, a PSTN gateway and a gatekeeper, with all endpoints registered to the MCU. Cloud-hosted video conferencing adds dynamic multi-server clustering, which improves resilience and availability and is now widely used in government, transport, finance, telecoms, education and enterprise environments.

We supply room systems, desktop clients and cloud bridging, and can integrate the video platform with the PBX so that audio and video share one dial plan.