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Understanding your options
BT SIP offers services including a simple BTNet ISDN SIP replacement through to true end to end SIP trunking connectivity.
As an Authorised BT Partner, we operate a workshop which is fundamentally designed to ensure BT SIP does not become a commodity. And, with the best possible BT SIP Trunk Pricing direct.
The workshops include dedicated BT resource and are suitable for Enterprise clients and SME’s. BT have also tested Cisco, Mitel and Avaya gateways and will continue to test specific versions for compatibility vs your features and requirements.
Whether you’re starting from scratch or someway down the SIP path, BT SIP trunking offers a well engineered, stable platform.
In both instances, Internet or MPLS, traffic may be prioritised to ensure BT SIP deliver you a service level agreement based on performance. With MPLS, SIP is prioritised via use of QoS (Quality of Service). BTNet SIP is also prioritised even though the traffic is sent using the BTNet public IP backbone. The guarantee of traffic is one element but we’ll help you ensure the correct parameters are met based on several factors as follows:
- The quantity of channels
- The type of CODEC you’re looking to run across your service
- Overall bandwidth required together with existing traffic
- Latency and jitter depending on access method and destination of BT SIP traffic on a global and UK basis
- Commercials – without the need for a converged environment, BT traditional voice maybe more suitable
Whether or not these acronyms are confusing, we offer a workshop to run through the end to end aspects of BT SIP trunking.
The amount of channels you require are normally fairly easy to calculate since you will have an existing infrastructure plus a potential growth. This is a key area of SIP – flexibility. With traditional ISDN services, if you reach the maximum of your ISDN circuit, a further circuit must be ordered which has lead times and a cost implication.
Adding additional channels to SIP is simplistic and does not require a new circuit unless your capacity is reached. With Ethernet becoming prevalent, capacity is normally readily available.
The type of CODEC you will be running with your BT service will depend on the level of capacity within your circuit and your audio quality requirements. The majority of BT SIP solutions are sold with the G729 CODEC as clients generally budget 40k a call for Ethernet which is much less than the higher quality CODEC G711 which is approx 90k a call. This trend is changing though with the growth of higher bandwidth circuits.
One of the main drivers behind BT SIP trunking is unified communications. The ability to use a single circuit into BT for data, voice, video and Internet. When considering a unified proposition, existing applications and traffic should be reviewed to evaluate and determine the level of overall bandwidth required. This task may be completed using existing statistics or by considering the traffic types you’re running across your circuits.
Bandwidth is all very well but the performance in terms of latency and jitter will be the key factor when SIP is used over the longer term. With MPLS solutions, the latency and jitter is predictable. With BTNet Internet circuits, SIP performance is also predictable to an extent. It is only when the traffic leaves the BTNet Internet backbone to a different provider where issues may occur. We don’t recommend leaving the BT backbone unless the location is labeled as being OK to accept best effort quality.
The BT SIP service also offers great number portability, disaster recovery options, business continuity, fantastic footprint and flexibility with fast turnarounds. All of these elements are included within the monthly pricing schedules.
Table below shows the difference and the BT SIP view of G729 vs G711
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