About Zen Business Talk SIP
What is SIP trunking?
What is Business Talk SIP?
What equipment will I need to use Business Talk SIP?
What makes of PBX can the service work with?
How long does it take to set up the service?
Does the service support Number Porting?
How can I order Zen Business Talk SIP?
What is the minimum contract length?
How many users is this service suitable for?
Can I upgrade my service to be able to carry more calls?
Does the service support Emergency Calls?
Is the service Outbound / Inbound only or both ways?
What kind of numbers can I use on the service?
Is the service secure?
How much bandwidth does the Zen Business Talk SIP service use?
What happens to my Outbound Service if I lose my Internet connection or connection to your Voice server?
What happens to my Inbound Service if I lose my connection to your Voice server?
Which CODEC does the service support?
How are my calls billed?
Can I view my calls online?
How can I contact Zen Internet if I have a Voice related question?
What is SIP trunking?
SIP stands for Session Initiation Protocol, and is a mechanism for setting up and tearing down calls over data connections.
What is Business Talk SIP?
Business Talk SIP (Session Initiation Protocol) is a cost effective method of making calls over data connections.
What systems/equipment will I need to use Business Talk SIP?
You should have either a SIP enabled PBX, also known as an IP PBX, or a TDM-IP Gateway to convert the signals to SIP. Most PBX’s made in the last 5 or so years are IP enabled. We have included more information about Zen's approved SIP Trunking systems in the Additional Information tab
What makes of PBX can the service work with?
We have customers using the service connected to the following devices:
- Asterisk
- Cisco Unified Communications Manager
- Cisco Call Manager
- Cisco / Linksys SPA9000
- 3CX
- Avaya IP Office
- UM Labs Security Controllers
- Vegastream Gateways
- Draytek Vigor
- SNOM
- SWYX
- Siemens
How long does it take to set up the SIP trunking service?
Once your order details are confirmed and submitted, the configuration details will be with you within 3 working days.
Does the service support Number Porting?
Yes, you can bring (or Port) your existing phone numbers over to the service. There is a fee for doing this, which is dependent on the types of numbers you with to port.
How can I order Zen Business Talk SIP?
Please contact your Account Manager directly or complete our online enquiry form.
What is the minimum contract length?
One month.
How many users is this service suitable for?
There are options available for businesses with 4 users or more. Choose the Option that is right for your business size.
Can I upgrade my service to be able to carry more calls?
Yes. Please contact your Account Manager directly or call us on 0845 058 9000 to discuss this further.
Does the service support Emergency Calls?
We strongly recommend that you make Emergency calls using a standard fixed line telephone; this will ensure that the Emergency Operator is provided with your location details.
If you do make an Emergency call across our Voice network, we will endeavour to carry the call. However, we can make no guarantees that we will be able to and there may be issues with location information, this will normally mean you will need to advise the Operator of your location.
Is the service Outbound / Inbound only or both ways?
You can configure the service for either Outbound only or both ways. If you require it to be both ways you will need to order at least one Inbound Number.
What kind of numbers can I use on the service?
We can provide you with UK Geographic (01, 02, and 03) numbers, as well as 05 VoIP numbers
Is the service secure?
Yes. Your Business Talk SIP service user name and password are linked to the IP range of the Zen connection you use to make phone calls. In addition to this, an encrypted authentication takes place between your connection and our SIP platform.
How much bandwidth does the Zen Business Talk SIP service use?
A call made via Business Talk SIP uses approximately 80Kb per second which equates to roughly 0.60MB per minute. If you were to make over 55 hours worth of telephone calls you would use approximately 2GB of any download cap you have.
What happens to my Outbound Service if I lose my Internet connection or connection to your Voice server?
If there is no connection to our Voice platform your outbound service will be lost. We recommend that you make provision to route calls over the PSTN if you lose connection to our server.
What happens to my Inbound Service if I lose my connection to your Voice server?
If there is no connection to our Voice platform your outbound service will be lost. We recommend that you request Inbound Call Failover at point of order, this will automatically re-route calls to an alternative destination in this scenario.
Which CODEC does the service support?
Business Talk SIP only uses G.711, providing the best speech quality possible.
How are my calls billed?
Calls are billed by the second, and on a monthly basis.
Can I view my calls online?
Yes, hourly itemised call information is available on-line in the portal that can be accessed at
How can I contact Zen Internet if I have a Voice related question?
You can contact us on voice feedback or ring our sales team on 0845 058 9000.