Source note · Setting up FreePBX with a SIP trunk
On a PJSIP extension, RTP Symmetric sends RTP back to the address it came from, and Sangoma says enabling it is usually a good idea when the device is behind NAT.
Checked 2026-09-25
If this device is natting in it is usually a good idea to enable this.
- Vendor
- Sangoma
- Product
- FreePBX
- Subsystem
- Extensions module
- Deployment
- on-premises
- Region
- not restricted
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- PBX GUI - Extensions Module - PJSIP Extension — Sangoma · tier 2 current vendor documentation · Advanced, RTP Symmetric
Cite this note
APA
WarmTransfer. (2026, September 25). Setting up FreePBX with a SIP trunk: source note freepbx-sip-trunk-setup-extension-rtp-symmetric. WarmTransfer. https://warmtransfer.net/knowledge/claims/freepbx-sip-trunk-setup-extension-rtp-symmetric
BibTeX
@misc{warmtransfer-claim-freepbx-sip-trunk-setup-extension-rtp-symmetric,
title = {Setting up FreePBX with a SIP trunk: source note freepbx-sip-trunk-setup-extension-rtp-symmetric},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/freepbx-sip-trunk-setup-extension-rtp-symmetric},
note = {Source note freepbx-sip-trunk-setup-extension-rtp-symmetric, checked 2026-09-25}
}