--- title: Connect Exotel SIP trunking to Pipecat (via Daily) slug: exotel-agentstream/connect-exotel-sip-trunking-to-pipecat-via-daily createdAt: 2026-04-01T16:28:10.199Z --- This guide aligns **Exotel SIP trunking** with **Pipecat** using the same **Exotel** patterns as the other Voice AI integrations in this repository: **outbound** = create trunk → map DID → credentials; **optional ACL** = static IPs only (mask: 32), no CIDR ranges on the trunk; **inbound** = destination URI on the trunk when routing toward a **fixed** SIP partner; **Connect** = **sip:\** where Exotel’s product uses that form. **GitHub repo (reference):** https\://github.com/exotel/AgentStream-VoiceAIEcosystem :::BlockQuote **Applicability:** **API/engineering-driven** (Pipecat orchestration + Daily rooms/SIP). Inbound is typically a **dynamic** Daily sip\_uri bridge, not a single static destination URI. ::: **Pipecat is not a SIP trunk provider.** Pipecat agents typically use **Daily** for **WebRTC** and **SIP dial-in / dial-out**. Pipecat publishes a **PSTN + Daily SIP walkthrough** (upstream doc path). Treat **Exotel** as the **PSTN carrier**: your **webhook server** still creates a **Daily room with SIP** and bridges the live call to Daily’s **sip\_uri** after **on\_dialin\_ready**. ## What Pipecat + Daily expect | Topic | Detail | | ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------- | | SIP on rooms | [Daily SIP](https://docs.daily.co/guides/products/dial-in-dial-out/sip) — sip\_uri on the room, dialin-ready / Pipecat **on\_dialin\_ready** | | PSTN example | [Pipecat PSTN + Daily SIP guide](https://docs.pipecat.ai/guides/telephony/twilio-daily-sip) — webhook → Daily room → forward to **sip\_endpoint** | | PSTN without Exotel | [Daily PSTN ](https://docs.pipecat.ai/guides/telephony/daily-pstn)— Daily-provisioned numbers | ## What you will set up | Direction | Summary | | --------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | **Inbound (typical)** | PSTN → Exotel → **your webhook** → Daily room + SIP → **bridge** to Daily **sip\_uri** (same **shape** as Pipecat’s PSTN guide; use **Exotel** call-control APIs to attach the live leg to **sip\_uri**) | | **Outbound** | Daily **SIP dial-out** / start\_dialout → **Exotel edge IP\:port** (digest) → PSTN — **Exotel** trunk + DID + **POST .../credentials** | ## Part A — Pipecat + Daily 1. Follow **[Pipecat’s PSTN + Daily SIP guide](https://docs.pipecat.ai/guides/telephony/twilio-daily-sip)** to implement **DailyTransport**, **on\_dialin\_ready**, and bridging to **sip\_endpoint**. 2. Replace the **sample carrier** control APIs from that guide with **Exotel’s** documented way to **connect the active carrier leg** to an **external SIP URI** (your Daily sip\_uri for that session). Confirm details with [Exotel](https://docs.exotel.com/dynamic-sip-trunking) if needed. 3. For **outbound**, use Daily’s **dial-out** / **SIP dial-out** toward **Exotel** as the next SIP hop, then complete **Part B**. **Note:** Daily exposes a **per-room** sip\_uri. The **static trunk destination** pattern (single SIP host for all calls) matches some Voice AI platforms but **differs** from typical **Daily** room SIP — prefer the **dynamic bridge** unless you operate an **SBC** or fixed ingress. ## Part B — Exotel (outbound SIP toward PSTN) When **Daily** (or your SIP client) sends media to **Exotel** to reach PSTN: 1. **Create trunk** 2. **Map DID** — POST .../trunks/{TRUNK\_SID}/phone-numbers 3. **POST .../credentials** — user\_name, password (digest aligned with the SIP client leg) **Optional:** POST .../whitelisted-ips **only** if Daily (or your egress) publishes a **single static IP** you must allow. Use **mask: 32**. ## Part C — Exotel (inbound PSTN toward a fixed SIP host) Use **only** when your **partner SIP** destination is **fixed** (not the usual **per-room Daily sip\_uri** case): 1. **POST .../destination-uris** on the trunk toward that host/port/transport. 2. **Flow → Connect** applet: **Dial whom** = **sip:\** (the **trunk\_sid** from Exotel **create trunk** — not a full SIP URI). 3. Map the Exophone to the Flow. ## Exotel API snippets **Authentication:** https\://API\_KEY\:API\_TOKEN\@api.in.exotel.com/... **Rate limit:** **200 requests/minute** on trunk configuration APIs. [Exotel SIP trunk API Reference for Voice AI](docId\:jQ98JRRnXtZaUDYoGOdMZ) ## Troubleshooting | Symptom | What to check | | ------------------------------ | --------------------------------------------------------------------------------------------------------- | | Call never reaches Daily | Exotel **bridge** to the **current** sip\_uri; room **SIP** enabled; **dialin-ready** / on\_dialin\_ready | | One-way audio / codec mismatch | **SDP** codecs — Daily **PCMU/PCMA** vs Exotel PSTN leg | | Outbound fails | Trunk **credentials**; **Exotel edge IP\:port** and transport; DID on trunk | | Connect misrouted | **sip:\** only in **Dial whom** (when using that applet pattern) | ## Official references | Resource | URL | | -------------------------- | --------------------------------------------------------------------------------- | | Daily dashboard | https\://dashboard.daily.co/ | | Pipecat — PSTN + Daily SIP | https\://docs.pipecat.ai/guides/telephony/twilio-daily-sip | | Pipecat — Daily PSTN | https\://docs.pipecat.ai/guides/telephony/daily-pstn | | Daily — SIP | https\://docs.daily.co/guides/products/dial-in-dial-out/sip | | Pipecat phone example | https\://github.com/pipecat-ai/pipecat-examples/tree/main/phone-chatbot | | Exotel SIP API | https\://docs.exotel.com/dynamic-sip-trunking/detailed-sip-trunking-api-reference |