Standard SIP Trunking

Introduction to Standard SIP Trunking

Standard SIP Trunking is a flexible and scalable next generation voice solution that can be supplied over various types of access technologies, ranging from quality enabled fibre to best effort fixed and mobile technologies.

What is Standard SIP Trunking?

The Standard SIP Trunking Solution combines a variety of technologies which allows you to make and receive calls over a data connection. This solution consists of two components:

  • A number of SIP sessions and
  • An access service.

Any data service can be used for a Standard SIP Trunk including 3rd party internet access.

It should be noted that when the Standard SIP service is provided over a best effort access technology, either fixed or mobile, provided by BCX or any third party operator, the quality and experience of the voice cannot be guaranteed. The quality can be affected by user behaviour, network congestion, variable delays, data caps, etc. When a BCX best effort access and ISP package are used, we have the ability to prioritise the voice traffic, however due to the variable characteristics of best effort access technologies, the quality of the SIP service could vary accordingly. These risks will be annulled by using BCX quality enabled access products, resulting in quality voice services.

How Will Standard SIP Trunking Benefit My Business?


  • Various redundancy and backup options are available which will insure maximum uptime and availability of the SIP service.


  • A minimum of 2 SIP sessions are required where after the number of sessions can be increased in increments of 1 session, according to your requirements.


  • The solution is designed and implemented to meet the unique business requirements of every customer.

Keep your old numbers

  • The solution allows the retention of legacy numbers and ranges, which eliminates the hassle of advertising new numbers

More About Standard SIP Trunking

Standard SIP Trunking is a flexible solution that supports various customer requirements. A Standard SIP Trunk can be provided over any type of data access, including 3rd party internet access, broadband access and quality enabled fibre access. The quality and experience of the service will depend on the characteristics of the access service. If an uncontended fibre service, which is configured for real time traffic is used the voice quality will be of a continuous high quality. However there is a price difference between the different access options, therefore it is important to find an acceptable balance between price and quality.

A managed, quality enabled VoIP Connect Access will ensure predictable high quality voice. A VoIP Connect access link consists of a quality enabled BCX Metro Ethernet (ME) fibre, a proactively managed Cisco router and an availability SLA on the fibre access link. A Session Border Controller (SBC) is not mandatory for the deployment of a Standard SIP Trunk, however we highly recommend the deployment of a SBC for security reasons and to resolve interoperability problems. Our range of PBX’s have been certified against the BCX Standard SIP Trunk and no interoperability issues will be experienced between our network and a BCX provided PBX. Some of the Standard SIP Trunk redundancy configurations may however require a SBC for implementation. The Standard SIP Trunk is a registration based service where a user name and password will be provided to the customer for authentication purposes.


Non-redundant access deployment This is the most basic deployment configuration. In this deployment a single access link will be provided between our network and your business premises. In the diagrams below are high-level examples of the deployment of non-redundant Standard SIP Trunk solutions. In the event that the access fails the SIP Trunk service will be unavailable until the access service is restored.

Backup access deployment

In a backup deployment two access links will be dimensioned between the customer premises and the BCX network. The characteristics, capacity and bandwidth capability of the two access links do not have to be the same. One access link will serve as the primary access link and the second one as a backup access link. During normal operation all voice traffic will transverse via the primary access link, in the event of a failure the customer will be able to switch over to the backup link, which will allow the customer to access the original amount of SIP sessions, numbers and number ranges. The call capacity on the backup link should be managed by the customer to ensure the bandwidth of the backup access link is not exceeded. When the failure on the primary access link is restored the customer will be able to switch the voice traffic back to the primary access link. It should be noted that the switchover between the two access links will not be initiated by BCX. By implementing a customer SBC, the switchover can be automated alternatively it can be done manually. In the diagram below is an example of a backup deployment using VoIP Connect and Internet access.

Redundant access deployment

In a redundant access deployment two VoIP Connect Access links will be provided. One VoIP Connect will be in an active state, while the other VoIP Connect will be in a standby state. In the event of a failure of the active VoIP Connect Access link, the standby VoIP Connect Access link will be activated and all the voice traffic will be routed via this access link. In the diagram below is a high-level schematic of a redundant deployment.

Why Choose BCX?


Seamlessly migrate your legacy service numbers to the SIP Trunk


The Solution is designed and built to meet your unique requirements


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