SIP Trunking

At its simplest, SIP Trunking provides ISDN replacement into existing PABX’s to provide you cheaper access charges. SIP Trunking is about more than cost savings on access.

We see it is a critical element in unifying all elements of your telecoms infrastructure. It provides a homogenous communications strategy across all your platforms and sites and retains existing investment.TDM Group’s SIP Trunking extends cost reduction by overlaying next generation Intelligent Network services. This includes sophisticated queuing, inbound call statistics, centralised reception, remote working, distributed call centres and desk-to-desk dialling.Each SIP Trunk supports one concurrent external call, equivalent to one ISDN channel. For most companies this represents a saving of up to 75% compared to ISDN.All elements of your numbers and call routing policy are unchanged. In this way you can VoIP enable any PBX and provide you a community of users rather than individual islands.Inbound Calling

Options:

Number Porting – Retain existing phone numbers. We can port numbers from every carrier
Extension to Extension – SIP Trunk extensions can call a hosted PABX extension in the same or another office, just by dialling the extension number
Multi Mixed Extensions – Users that have an office extension from the existing PABX, but want a home phone can use Shared Call Appearance. This provides multiple phones ‘twinned’ on the same extension/DDI number
CLI Presentation – Any extension user is able to present either a group CLI or Individual DDI
Call Queuing – Queue callers in the VanillaIP core further reducing the number of channels required locally
Call Recording – Can be activated for PABX extensions on inbound and outbound calls
Non Geographic Numbers – Provide 07,08,09 numbers as ‘logical’ numbers without any divert to a geographic DDI
International Numbers – Supply your customers with international numbers from over 35 countries. Connect direct with no diversion chargesSIP Trunking offers a number of advantages over traditional ISDN:
Installation Line Cost Reduction – The installation cost for SIP Trunking is up to 80% cheaper than ISDN installation costs.
Increasing Capacity – Where an existing PBX is at capacity, SIP trunking allows for deployment of hosted extensions alongside the existing system. All users can have a common numbering plan and desk-to-desk dialling.
Linking Remote Sites or Home Workers – SIP Trunking allows Remote Workers to be integrated within the main office with on-net calling and group service membership, without the complexity of tunnelling service (Q-sig, DPNSS, VPN’s) out from the PBX.
Call Queuing and Statistics – Because inbound calls queue in the network core, there is no need to stack ISDN locally just to provide queuing and comfort messages to callers.

For inbound call centres, which typically have a higher number of ISDN channels than Agents, this represents a massive cost saving. We can also provide statistics on the volume and pattern of incoming calls with abandoned ratios, average wait/talk times etc.
UK Geographic Numbers – SIP Trunking allows your London office to have a Manchester number delivered directly. This allows you to publish local numbers around the UK without having to pay diversion charges back to the main office.