Power Trunk supported combinations and technical limits
Reference guide for supported combinations of SIP Trunk, Third-Party Apps, AI Voice Agent, and Call Recording in Power Trunk, plus technical limits.
Written by B3Networks Academy
Updated at November 12th, 2026
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Use this reference table to check which combinations of User endpoint (SIP Trunk or 3rd-Party App), AI (AgentDuet), and Recording (B3 Own Recording or SIPREC) can be turned on together on the same Power Trunk.
Supported service combinations
| # | Combination | What happens to the call | Supported? |
|---|---|---|---|
| 1 | SIP Trunk (alone) | Your SIP PBX/SBC answers incoming calls and places outgoing calls. | Yes |
| 2 | SIP Trunk + AI | AI (AgentDuet) answers incoming calls first and transfers to your SIP PBX/SBC when needed. |
Yes |
| 3 | SIP Trunk + B3 Own Recording | SIP PBX/SBC answers; B3 records the call audio natively. | Yes |
| 4 | SIP Trunk + SIPREC Recorder | SIP PBX/SBC answers; call audio is streamed via SIPREC to your external recorder (ASC, Touch Suite, etc.). |
Yes |
| 5 | AI (alone, no endpoint) | User section is set to None; AI (AgentDuet) answers, handles, and completes the call. |
Yes |
| 6 | AI + B3 Own Recording (no endpoint) | User section is set to None; AI answers and B3 records the conversation. |
Yes |
| 7 | AI + SIPREC Recorder (no endpoint) | User section is set to None; AI answers and audio is streamed to your external SIPREC recorder. |
Yes |
| 8 | 3rd-Party App (alone) | Connected calling app (MS Teams, Zoom Phone, Webex, etc.) receives and places calls. |
Yes |
| 9 | 3rd-Party App + AI | AI (AgentDuet) answers incoming calls and transfers to the 3rd-party app when needed. |
Yes |
| 10 | 3rd-Party App + B3 Own Recording | Connected 3rd-party app receives the call; B3 records the call audio. | Yes |
| 11 | 3rd-Party App + SIPREC Recorder | Connected 3rd-party app receives the call; audio is streamed to your external SIPREC recorder. | Yes |
| 12 | 3rd-Party App + AI + Recording | Simultaneous 3-way combination (3rd-Party App + AI + Recording). |
No |
| 13 | SIP Trunk + AI + Recording | Simultaneous 3-way combination (SIP Trunk + AI + Recording). |
No |
Combinations that are not allowed
- SIP Trunk + 3rd-Party App at the same time: Choose either SIP Trunk or a 3rd-Party App in the User section, not both.
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Recording alone (with no endpoint and no AI): Recording requires an active endpoint (
SIP Trunk,3rd-Party App, orAI) to answer the call. -
3-way combinations (
#12and#13): Turning on an endpoint (SIP Trunkor3rd-Party App), AI, and Recording all at the same time on the same trunk is not supported.
Technical limits
| Setting | Limit / Rule |
|---|---|
| IP Allowlist & IP Peer addresses | Up to 2 single public IPv4 addresses (/32). CIDR subnets (/24), IPv6 addresses, and private IPs are not accepted. |
High Availability zones (Zone A / Zone B) |
2 built-in HA nodes per trunk, assigned automatically by your trunk's Location (SG, MY, ID, TH, VN). Zone information is read-only and fails over automatically within 2.5 seconds. |
Switching Account → Access Token |
Requires typing CONFIRM. Permanently deletes old SIP credentials and removes local AI and Recording settings on the trunk so the receiving platform manages its own destination and services. |
| B3 Own Recording capacity | Your B3 Own Recording session count must not exceed your trunk's Concurrent Session count. |
| Signaling & media specs | • Signaling: SIP (RFC 3261), TLS 1.2+ on port 5061 (PCMA) / 5081 (Opus), registration timer 3600s.• Media: SRTP on UDP ports 10000–30000, codecs G.711 A-law, G.711 U-law, and Opus, DTMF RFC 2833.• STUN Server: stun.b3networks.com (for PBXs behind NAT). |