Replace rigid, conventional phone lines with SIP trunks — add anything from one to hundreds of lines without new hardware at your premises.
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Vision Telecom’s SIP trunk service frees your business from rigid, physical phone lines. Instead of ISDN or analogue circuits, a SIP trunk carries your calls over a data connection — so you can add anything from one to hundreds of concurrent lines without new hardware on site, cut call costs, and keep the numbers your business already uses.
A SIP trunk is a virtual connection between your on-premises or hosted PBX and the public telephone network, carried over your internet or private link. Because calls travel over data, you route them off the traditional phone network — reducing per-call and rental costs — while retaining full dialling and your existing numbers.
Contact centres and sales teams needing many concurrent lines, multi-branch businesses consolidating telephony, and organisations replacing ageing ISDN with a scalable, lower-cost alternative.
Cut your call costs and scale voice on demand. Get a SIP trunk quote or call +(92) 42-111-111-200.
| Feature | Details |
|---|---|
| Capacity | From one to hundreds of concurrent lines, added or removed on demand |
| Hardware | No additional hardware needed at your premises |
| Numbers | No geographic constraint — area codes work from any location with a data connection; existing numbers can typically be kept |
| PBX | Connects to your on-premises IP PBX or a hosted PBX |
| Delivery | Over your internet or private data link |
| Support | 24x7x365 technical support |
| SIP trunk | ISDN PRI | Analogue lines | |
|---|---|---|---|
| Channels | Scales from 1 to hundreds on demand | 30 per PRI | One call per line |
| Adding capacity | A configuration change | Another PRI circuit | New physical lines |
| Rental cost | Lower | Higher | Higher per line |
| Numbers across cities | No geographic constraint | Tied to the circuit location | Tied to the exchange |
One SIP trunk can carry all the numbers your business uses, so callers reach you the same way wherever your team sits:
Our trunks connect to standard SIP-based IP-PBXs such as Asterisk, FreePBX and 3CX, and to Sangoma platforms. Don’t have a PBX? Our Hosted Virtual PBX gives you a cloud phone system with the trunk included. Still on PRI lines? We continue to support ISDN PRI and can run both side by side during migration.
Calls can be re-routed to mobiles or another office if your PBX or site goes down, and the trunk can be bundled with Dedicated Internet Access or IP MPLS so voice runs on a managed connection with one provider and one SLA.
An IP-PBX or SIP-enabled phone system and a reliable data connection. We can supply both.
Usually not. The trunk connects to your PBX, so your existing handsets keep working as long as the PBX supports SIP.
Anything from one to hundreds, and you can add or remove channels as call volumes change.
Yes — calls travel over data, so we size the link for voice and can deliver the trunk over a dedicated connection.
One channel per concurrent call. Many offices need channels for around a quarter to a third of their staff; call centres usually need one per agent.
In many cases, yes. Our team will confirm what can be moved during the requirement call.
Ready to talk? Call +92 42-111-111-200 or email info@visiontelecom.com.pk for a SIP trunk quote.