SIP Trunk FAQs

Put in the simplest possible terms, IP Site Connect uses an IP VPN connection, which is secured, to connect your PBX system to our own soft switch. We use our national fibre optic network to achieve this. This special connection allows you voice calls to be carried as Voice over Internet Protocol (VoIP), onto the Switched Public Telephony Network (PSTN). In this way you can make and receive calls in the same way you are used to.

A SIP trunk blends the connections for data and voice into a single line, making it possible for the data network to carry voice data. This functionality in turn facilitates long-distance calls, directory listings, and caller ID integration to a company’s existing telephony system. There are three primary components in SIP trunking:

• IP PBX: An IP-based PBX communicates over an IP network, and also switches calls between VoIP users on local lines allowing users to share a number of external phone lines.
• Internet telephony service provider (ITSP): The ITSP is responsible for the connectivity to the PSTN from an IP network, and transports IP communications across the internet.
• Border element: This facilitates connectivity between an enterprise IP network, PSTN, and an external IP-carrier network. Usually managed by the service provider, the border element is often a SIP-capable firewall or a SIP-enabling edge device.

It is quickly becoming a universal standard to adopt SIP (Session Initiation Protocol) for business communication purposes. This standard is used by SIP Trunking to enable businesses to make calls and receive calls through traditional telephone lines by means of VoIP (Voice Over Internet Protocol). This is done through data networks.

In addition, SIP trunking enables you to combine both voice and data over a single network connection. This benefit will almost certainly save you a significant amount of money and time. We offer both managed and unmanaged IPVPN services, allowing you to make the most out of your existing network. We can also connect you to a wide range of other devices and PBX systems.

There are a number of benefits for your company in investing in SIP trunking, including:

• Allows companies to outsource PSTN connectivity to a third party, reducing long-distance phone charges
• Eliminates investment in costly TDM-gateway equipment infrastructure
• Enables dial codes to increase regional presence
• Reduces month expenses

• If you replace your existing ISDN30 network with IP Site Connect, you will most certainly save money on the rental charges for SIP trunking.

• Simply because it is possible to share SIP trunks between numerous sites you will be able the use less channels at each site when compared with ISDN30.

• If you opt to add voice to data, you can expect the installation costs to be much lower. You will need fewer visits from engineers and you will experience much less disruption to your company activities.

• SIP Trunking solutions are simple easier than any other system. This is especially true if you have to move your service. This is because you do not have to replace or change your telephone sockets, pull up flooring or even to change your cabling.

• You can change to SIP Trunking at your own leisure and pace. You do not need to change all your traditional telephones at once. In fact, SIP Trunking will help you to devise a manageable migration plan.

• You will have all the telephone features you can possibly need. This includes Direct Dialling Inwards (DDI), Call Line Identity (CLI) and even Caller Line Identity Presentation (CLIP). In addition toy can expect features such as Caller Line Identity Restriction (CLIR) and presentation numbers too.

• The system will make sure that your organization is hundred per cent ready for unified communications. Your business will be in the forefront of technology and will be able to use the latest technology.

• You will have access to the largest fibre optic network in the United Kingdom. This network serves more than eighty five per cent of businesses in the UK and it delivers extremely high-speed communications.

• You will be able to benefit from the new geographical service standard. You can even obtain more resilience options for a small additional fee. This means that you will be able to obtain a secondary transport route between your own network and ours.

Why should you use SIP Trunking in place of ISDN30?

Quite simply, ISDN30 has evolved into the more efficient and advanced ISP Trunking service. The latter offer significant benefits:

• PBX systems are now manufactured according to SIP standards. With a SIP Trunking system you will not need ISDN30 circuits at each of your sites. This means that you will be ready for Unified Communications.

• You can use any spare capacity for wide area network connectivity and ordinary Internet access.

What are your network requirements?

Your local area network or wide area networks should be QoS enabled from end to end. This is because any network may experience congestion and you therefore need to make sure that the quality of your calls remains consistent.

The costs of sip trunking comparison to ISDN are relatively modest. SIP-based technology, such as an IP PBX, IP phones, soft clients, and SIP-friendly firewalls, may require initial investment, but the cost-savings on call costs will see you enjoy substantial ROI in no time.

You will not experience any disruptions when we manage your migration to IP Site Connect.