The firewall in front of Asterisk likely needs to admit UDP from Twilio's 168.86.128.0/18 media range to Asterisk's own rtpstart-rtpend range, since Twilio requires its media ranges allowed and Asterisk receives RTP only on that range.
inferred · Checked 2026-09-24
- Vendor
- Sangoma
- Product
- Asterisk
- Subsystem
- network
- Deployment
- self-hosted
- Region
- not restricted
- Release range
- current as of 2026-09-24
- Status
- inferred
- Checked
- 2026-09-24
Sources
- Elastic SIP Trunking IP addresses — Twilio · tier 2 current vendor documentation · Media gateways table and operational notes (combined with rtp.conf sample)
Cite this note
APA
WarmTransfer. (2026, September 24). Setting up an Asterisk PBX with Twilio Elastic SIP Trunking: source note asterisk-twilio-pbx-setup-firewall-rtp-pairing. WarmTransfer. https://warmtransfer.net/knowledge/claims/asterisk-twilio-pbx-setup-firewall-rtp-pairing
BibTeX
@misc{warmtransfer-claim-asterisk-twilio-pbx-setup-firewall-rtp-pairing,
title = {Setting up an Asterisk PBX with Twilio Elastic SIP Trunking: source note asterisk-twilio-pbx-setup-firewall-rtp-pairing},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/asterisk-twilio-pbx-setup-firewall-rtp-pairing},
note = {Source note asterisk-twilio-pbx-setup-firewall-rtp-pairing, checked 2026-09-24}
}