--- title: Connect Exotel SIP trunking to Bolna Voice AI slug: exotel-agentstream/connect-exotel-sip-trunking-to-bolna-voice-ai createdAt: 2026-04-01T17:39:15.612Z --- This guide aligns **Exotel SIP trunking** with **[Bolna AI](https://www.bolna.ai/)** using the same patterns as the other Voice AI integrations in this repository: **outbound Exotel** = create trunk → map DID → credentials; **inbound** = destination URI on the trunk; **Connect** = **sip:\**; **ACL** = static IPs only (mask: 32), no CIDR ranges on the trunk. **GitHub repo (reference):** https\://github.com/exotel/AgentStream-VoiceAIEcosystem :::BlockQuote **Applicability:** **Hybrid** — BYOT is **API/config-driven** (SIP trunk objects) and may also have portal steps depending on account access (SIP is Beta). ::: **Outbound SIP is supported.** With BYOT, Bolna **places outbound PSTN calls over SIP** through your trunk: it resolves from\_number to your trunk, then signals to your **gateway** (Exotel **edge IP\:port**) using **userpass** (or **ip-based**) auth. That is the flow described in Make Outbound Calls via Your SIP Trunk. **Part B** below is exactly what Exotel needs on the **carrier** side for that outbound SIP leg. Bolna also offers a **dashboard connector** for Exotel (REST API link) — see Connect Your Exotel Account to Bolna. This article focuses on **SIP BYOT** where you configure **Exotel SIP trunking** and a **Bolna SIP trunk** together. :::BlockQuote **Bolna:** SIP trunking is **Beta**; **SRTP is not supported** (plain RTP). See Bring Your Own SIP Trunk. **Engineering detail:** \[bolna/integrations/exotel-vsip/bolna-exotel-voice-ai-connector.md]\(../../bolna/integrations/exotel-vsip/bolna-exotel-voice-ai-connector.md) **Quickstart:** \[bolna/integrations/exotel-vsip/QUICKSTART.md]\(../../bolna/integrations/exotel-vsip/QUICKSTART.md) ::: ## What Bolna expects (BYOT) | Topic | Detail | | ------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Create trunk | [Create SIP Trunk API](https://www.bolna.ai/docs/api-reference/sip-trunks/create) — POST https\://api.bolna.ai/sip-trunks/trunks with Bearer token | | Auth | userpass (username/password) or ip-based with IP identifiers on Bolna | | Gateway | Points to your carrier — for Exotel, use **Exotel edge IP\:port** from [Exotel network doc](https://docs.exotel.com/dynamic-sip-trunking/network-and-firewall-configuration) | | Inbound origination | Carrier sends traffic to **sip:13.200.45.61:5060** per [Receive Inbound Calls via Your SIP Trunk](https://www.bolna.ai/docs/sip-trunking/byot-inbound-calls) — confirm in current Bolna docs | | Outbound calls | [Make Outbound Calls via Your SIP Trunk](https://www.bolna.ai/docs/sip-trunking/byot-outbound-calls) — agent telephony\_provider: sip-trunk, from\_number on trunk | ## What you will set up | Direction | Summary | | ------------ | ------------------------------------------------------------------------------------------------------ | | **Outbound** | Bolna → SIP digest → Exotel edge → PSTN | | **Inbound** | PSTN → Exotel DID → trunk **destination URI** toward Bolna (13.200.45.61:5060 per Bolna) → Bolna agent | ## Part A — Bolna 1. Obtain **SIP trunk / BYOT** access (enterprise\@bolna.ai if required). 2. **Create SIP trunk** with gateway = **Exotel edge IP\:port** and userpass matching Exotel POST .../credentials — this is what enables **outbound SIP** from Bolna → Exotel → PSTN. 3. **Add phone numbers** to the Bolna trunk (required for from\_number on outbound calls). 4. Set agent telephony\_provider to sip-trunk, then place outbound calls with the [call API](https://www.bolna.ai/docs/sip-trunking/byot-outbound-calls) (from\_number must be a DID on the trunk). 5. For **inbound** only: map numbers to agents per [inbound BYOT](https://www.bolna.ai/docs/sip-trunking/byot-inbound-calls) and ensure Exotel routes to **sip:13.200.45.61:5060** per Bolna (Part C). **Alternative:** Use [Exotel provider connectio](https://www.bolna.ai/docs/exotel-connect-provider)n in Bolna **Providers** instead of manual SIP BYOT when that product path fits. ## Part B — Exotel (outbound SIP) 1. **Create trunk** 2. **Map DID** — POST .../trunks/{TRUNK\_SID}/phone-numbers 3. POST .../credentials — user\_name, password (same as Bolna auth\_username / auth\_password for userpass) **Optional:** POST .../whitelisted-ips **only** if Bolna publishes a **single static IP** you must allow on Exotel (Bolna docs reference **13.200.45.61** in troubleshooting — **always confirm** with current Bolna documentation). Use **mask: 32**. ## Part C — Exotel (inbound SIP) 1. POST .../destination-uris on the trunk so **inbound** PSTN is routed toward Bolna’s SIP entry (host/port per Bolna — typically aligned with **13.200.45.61:5060**; format per Exotel API). 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. Full reference: [Detailed SIP Trunking API Reference](docId:2OdDTEDmmf64scwjhGVkT) ## Troubleshooting | Symptom | What to check | | ------------------------ | ------------------------------------------------------------------ | | No media / failed SDP | **SRTP** — Bolna does not support SRTP; use plain RTP | | Outbound fails | Trunk is\_active on Bolna; gateway IP\:port; digest match | | Inbound never hits Bolna | Exotel **destination URI**; Bolna inbound\_enabled; number mapping | | Connect misrouted | **sip:\** only in Dial whom | ## Official references | Resource | URL | | ----------------------------- | --------------------------------------------------------------------------------- | | Bolna BYOT setup (start here) | https\://www\.bolna.ai/byot-setup | | Bolna SIP introduction | https\://www\.bolna.ai/docs/sip-trunking/introduction | | Bolna + Exotel (dashboard) | https\://www\.bolna.ai/docs/exotel-connect-provider | | Bolna Create SIP Trunk | https\://www\.bolna.ai/docs/api-reference/sip-trunks/create | | Bolna BYOT outbound | https\://www\.bolna.ai/docs/sip-trunking/byot-outbound-calls | | Bolna BYOT inbound | https\://www\.bolna.ai/docs/sip-trunking/byot-inbound-calls | | Exotel SIP API | https\://docs.exotel.com/dynamic-sip-trunking/detailed-sip-trunking-api-reference |