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An IP Telephony and PBX system is a modern digital communication ecosystem engineered to route voice, video, and conference calls over Internet Protocol (IP) networks rather than traditional analog telephone lines. Corporate headquarters, multi-branch offices, customer support call centers, and industrial facilities deploy these software-based PBX servers, IP-PBX System appliances, and individual IP Phone terminals to streamline internal communication and customer management. By integrating robust VoIP & GSM Gateway hardware alongside specialized Telephony Accessories, enterprises achieve seamless connectivity across mobile and landline networks. Upgrading your enterprise with a professional IP Telephony & PBX System guarantees crystal-clear voice transmission, flexible extension scaling, and advanced call-routing capabilities. Evaluating the right concurrent call capacity, SIP trunk compatibility, and network security protocols helps business leaders balance enterprise communication efficiency with cost-effective operations.
Selecting the appropriate IP PBX hardware requires matching line capacity and endpoint features to your office architecture:
What is an IP PBX telephony system?
An IP-PBX System (Private Branch Exchange) is a business telephone network that manages voice and video calls over Internet Protocol (IP) data networks rather than old-fashioned analog phone lines.
Can remote employees connect to an office IP PBX system?
Yes, staff working off-site can connect securely to the office PBX using software apps (softphones) or configured IP Phone units over an internet connection.
What is the purpose of a VoIP & GSM Gateway in a business network?
A VoIP & GSM Gateway converts digital VoIP signals into cellular GSM frequencies (and vice versa), allowing businesses to route calls over mobile SIM cards or back up landlines economically.
How does an IP PBX lower monthly phone bills?
By utilizing VoIP technology, SIP trunking, and cellular VoIP & GSM Gateway routing, companies bypass traditional telecom carrier long-distance charges, routing internal and mobile calls efficiently.
Where can I source reliable IP telephony and communication systems in Bangladesh?
DigiMark Solution provides professional communication hardware, security integration tools, and expert technical support for businesses across Bangladesh.
Read our Access Control Buying Guide or get a Quotation/Contact DigiMark Solution today to discuss your IP telephony and business communication requirements.
Indicative market ranges in Bangladesh as of 2026. Most Bangladeshi SMEs need a hybrid system — landline, GSM and SIP together.
60 extensions at 15% concurrency is 9 simultaneous calls. That is the number the PBX must support.
Most Bangladeshi office calls go to mobile numbers. Routing them over a SIM inside the PBX beats landline inter-network tariffs.
Sharing a flat network with file transfers and CCTV is the most common cause of choppy calls, and it is very hard to diagnose later.
Your published number keeps ringing, unchanged. This is the concern that stalls most migrations, and it is entirely solvable.
Fax machines, lift emergency phones, and older intercoms do not speak SIP. FXS ports keep them alive — but only if you find them.
A switch that runs out of PoE drops phones silently and intermittently. It looks like a network fault for weeks.
Every product we supply is genuine, with the manufacturer's official warranty.
IP phones from entry desk models to gigabit executive handsets, plus Wi-Fi models. Widest range we stock.
IP-PBX and IP audio. Strong on call recording and paging integration.
IP-PBX and gateways. FXS, FXO and GSM in one unit — the hybrid configuration most Bangladeshi offices need.
Entry IP phones run ৳4,500–8,500, mid-range PoE colour-screen models ৳8,500–16,000, and executive gigabit phones ৳16,000–32,000. Wi-Fi and cordless models run ৳12,000–26,000. The mid-range PoE phone is the volume choice for most offices.
Small systems supporting 20–50 extensions run ৳18,000–55,000. Mid-range systems for 100–500 extensions run ৳55,000–250,000. Price is driven by concurrent-call capacity and port configuration, not by extension count alone.
Yes. FXO ports bring your current PSTN lines into the IP-PBX unchanged, so the number on your signboard, business cards, and invoices keeps ringing exactly as before. This is the single most common concern that stalls IP migration, and it is entirely solvable.
Multiply extensions by busy-hour concurrency. General offices run at 10–15%, sales teams at 25–35%, and call centres at 70–90%. A 60-person office typically needs 9 concurrent calls. Sizing by extension count is how companies overspend by four to six times.
Yes, with FXS ports. Fax machines, lift emergency phones, and older intercoms do not speak SIP, but FXS ports keep them connected. Audit every analog device in the building before migration — this is where surprises happen.
The largest saving for most Bangladeshi companies is a GSM gateway routing calls to mobile numbers over a SIM rather than through landline inter-network tariffs. Inter-branch calling also drops to zero — for a company with several branches, that alone is significant.
About 100 kbps per concurrent call on G.711. Nine concurrent calls need roughly 900 kbps of guaranteed headroom, not shared with file transfers and CCTV. Voice tolerates packet loss far less well than data, so network quality matters more than raw speed.
