3CX (Dedicated) | E.164: Updating existing SIP Trunk

---

1. Open the SIP Trunks tab

2. Open the Voxtelesys SIP Trunk

3. Modify your Main Trunk Number

Change your Main Trunk Number to have the +1 in front.

• If you have a rule for your main number under Inbound rules you will need to delete the rule first.

4. Click on DIDs tab

If you have more DIDs to add click on the DIDs tab at the top.

5. Edit your DIDs

Add a +1 in front of your other DIDs.

6. Click OK to save changes.

7. Update Outbound rules

Update your Outbound rules following our guide if you do not want to dial +1 when calling out.

• You could also read our written tutorial here.

---