Cti Communications Ltd
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SIP to ISDN converter - SIP gateway

If your current ISDN phone system doesn't support SIP and you want to take advantage of cheap VoIP phone lines or any VoIP service without changing it then you need a SIP to ISDN converter (SIP gateway). Unplug from your BT ISDN box(es) and plug into the converter, your phone system doesn't know anything has changed.

We will configure the SIP to ISDN converter / SIP gateway with the details of your chosen SIP provider, you unplug from the ISDN & plug into the SIP to ISDN converter and start saving money.

After lots of moving of goal posts these units have finally been added to a very small list of approved devices that BT has approved to connect to BT SIP services, and is by far easiest to implement as well as the cheapest converter

Select the correct unit below to match your type of ISDN & the number of channel. New lower prices.

ISIP 8 - 1 BRI (2 channels) 320 240
ISIP 8 - 2 BRI (4 channels) 480 300
ISIP 8 - 3 BRI (6 channels) 550 320
ISIP 8 - 4 BRI (8 channels) 660 420
ISIP 30 - 10 channels 820 660
ISIP 30 - 20 channels 1,010 840
ISIP 30 - 30 channels 1,200 960

The iSIP SIP to ISDN converter / SIP gateway connects to a PoE class 1 supply. If you don't have one we can supply them for 20 and you will need us to set it up and configure it for 20.

You will need to enable SIP and RTP port forwarding in your firewall, and lock them to your VoIP exchange. In a Draytek 2860 or newer this takes 20 minuites, if you want us to do this for you we can and will charge our normal support rates.

Ports Locked to VoIP Exchanges

For updates and provisioning Port 443 needs to access isdnsip.com. On other routers it may take longer to set things up.

All prices exclude VAT, and were correct on 19/02/2021 16:05:07 , but should only be used as a guide.