How to set up your network for babelforce VoIP / SIP

Christina Dechent
Christina Dechent
  • Updated

All SIP signaling from babelforce will come from, IP and from

So the first step to prepare your network is to allow / and in your firewall.

If you get softphones from babelforce, we will configure them for you, so that they already have settings to allow them to find the right path through your network. We can also adapt the settings so that at each login, your softphone will automatically pick up the latest.

If you connect other desk phones or IP phones, then you will get account details from us. 

The best thing to do is to set up the phones and then test inbound and outbound calls while observing the traffic in your network.

The following diagram illustrates how communication works for inbound calls:




1. Your phone or your softphone will register with / using a port on your external IP, e.g. It will stay registered from this IP and port for some time. Note that port 1158 is an example, the phone/softphone will get a port dependent on its settings and the mapping between your external ports and the internal IP and ports used on the computers and devices.

2. When a call comes into your babelforce number (hotline, office number ...), / will send SIP signals to the user/agent phone, on in this example. This is why must be allowed in your firewall

3. The softphone will often have its own internal IP and port. So you must ensure that your mapping from external to internal IPs and ports is working right.


The best thing to do is set up a test case like the above in your babelforce account. Then do the inbound calls and outbound calls and check that the traffic is correctly traversing your network. 

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