What, Why and How?

SIP trunking provides access to and from the Public Switched Telephone Network (PSTN) over the Internet Protocol (IP). Unlike in traditional telephony, where physical wires were once delivered from the telecoms company to a business, a SIP trunk operates over an existing broadband or leased line allowing a company to replace their traditional fixed PSTN lines with PSTN connectivity via a SIP trunking service provider, such as O-Tel Telecom.
How it works

SIP Trunks are linked to a customer’s current telephone system which is either an IP enabled PBX or by using a Media VoIP Gateway, typically, a more traditional PBX. Outgoing calls are then routed through the PBX and out via the SIP Trunk instead
of using costly traditional phone lines.


The Benefits

SIP trunks offer significant cost-savings eliminating the need for costly analogue, ISDN BRIs (Basic Rate Interfaces) or PRIs (Primary Rate Interfaces). SIP trunks offer the flexibility of being able to route multiple calls from your existing local numbers,
anywhere in the world, to any national or international number within your company at the same cost. So a call to a Cape Town number may be
answered in London or NewYork.

SIP trunks allow home workers to be connected
to the main office using the internet allowing transparent customer communication.
SIP trunks can connect intraoffice PBXs eliminating the cost of intra office calls and offering the flexibility of overflowing calls to other offices at peak times or out of hours.

Service Features

O-Tel Telecom’s Business SIP trunk allows 5 channels (concurrent inbound calls) from a South Africa or Overseas numbers to be delivered to your PBX or handsets.
Additional trunks are available at R25 per channel per month.

Free Trial

We believe that the full benefits are better demonstrated than written and therefore offer a 30 day no obligations free trial to illustrate the benefits.

Multi-Vendor Device Support

* Gateways
* Softswitches
* Session Boarder Controllers
* Proxy Servers
* Softphones, SIP phones, and IADs

Billing and Costing

* Integrated pre/postpaid real-time billing and costing engine with call cut off
* Unlimited customizable charge plans for your clients (wholesale model).
* Blocked, flat rate, single rate and multi-tier rating (vary rate based on call duration)
* Costing by ANI, NPA, NPA+NXX, DNIS, time of day, day of week, date/time range and/or destination
* Ability to vary the scale of a minute at different intervals of a call.


* Centralized Reporting Engine to allow reports to be managed from within the portal
* Includes Live Call Flows

Real-Time Control and Monitoring.
Today’s competitive climate demands that businesses conduct their operations in real-time especially when it concerns network security, credit validation, rating and billing. O-Tel Telecoms Trunking solution helps to make your business more efficient and successful by performing its core functions in real-time resulting in improved cash flow and reduced collections, fraud and administrative overhead. Airtime replenishment can be done 24/7/365 securely via EFT. The world class automated system will ensure your service is one step ahead of the competition.
The following diagram illustrates how the service works and connects.