Using FreePBX with SDF VOIP

This tutorial shows how to add your SDF VOIP extension as a trunk in FreePBX.

Prerequisites

• A working FreePBX setup
• Access to the FreePBX admin interface

Procedure

In the admin interface follow these steps, replacing $EXTENSION and $PASSWORD with your extension number and password respectively:

1. Go to Connectivity » Trunks
2. Select Add Trunk and choose Add SIP (chan_sip) trunk
3. Set Trunk Name to sdf
4. Set Outbound Caller ID to <$EXTENSION@sip.sdf.org>
5. Set CID Options to Force Trunk CID
6. Go to the sip Settings tab
7. Set Trunk Name to SDF
8. Set peer details to:

   host=sip.sdf.org
   username=$EXTENSION
   secret=$PASSWORD
   type=friend
   context=from-trunk
   insecure=port,invite
   trustrpid=yes
   sendrpid=yes
   directmedia=no
   qualify=yes
   keepalive=45
   nat=yes
   dtmfmode=rfc2833
   disallow=all
   allow=ulaw

9. Go to the Incoming tab
10. Set Register String to $EXTENSION:$PASSWORD@sip.sdf.org
11. Click Submit

You can now define Inbound and Outbound routes using this new trunk. To test inbound calls, you can queue a test call through maint.

If you have an incoming DID through SDF, just a note that the SDF's system does not pass FROM_DID=. If you would like to route your call through a specific incoming route by DID, then add the DID after the registration string. For example: $EXTENSION:$PASSWORD@sip.sdf.org/$DID You can add the 11 or 10 digit number, just make sure it matches exactly to what you want in the incoming route.
$Id: sdf_voip_freepbx.html,v 1.5 2021/04/18 20:43:44 lokiwho Exp $