FreePBX Version 15 PJSIP Trunk Configuration
Simtex SIP Trunks from $4.99/month
Business-grade SIP trunking with geo-redundant infrastructure, crystal-clear audio, and Australian-based support. Pay-as-you-go or unlimited plans available.
SIP Servers:
- West Coast (AU):
siptcp.simtex.com.au - East Coast (AU):
siptcpeast.simtex.com.au
Choose the server closest to your location. FreePBX supports SRV record resolution — set the port to 0 and it will automatically discover our geo-redundant infrastructure.
Do not deploy FreePBX with an external IP address.
In 99.9% of cases you do not require any ports forwarded on your router or firewall. If you are unsure, speak to us first.
For security, limit the channel count to the number you'll actually need day-to-day. This prevents potential abuse if your system is compromised.
Port 0 = automatic discovery. FreePBX's PJSIP driver resolves SRV records when the port is set to
0, giving you automatic failover across our geo-redundant server farms. Do not set port 5062 here — let SRV handle it.East Coast? Replace
siptcp.simtex.com.au with siptcpeast.simtex.com.au in the SIP Server field if your server is located on the East Coast of Australia.Prefix tip: Configure a prefix (e.g.
0) for all external calls. This ensures internal extension numbers never overlap with external destinations — a standard practice in Australia.If you do not wish to make international calls, leave out the
0011 route pattern to prevent unauthorised international dialling.When using wildcard patterns, you must prefix with an underscore:
_618921133XXAlways disable SIP Guests on production systems. Leaving this enabled is one of the most common causes of toll fraud on FreePBX installations.
Last updated 26 March 2026