# I am having issues connecting retell with plivo for inbound calls i **URL:** \ **Category:** Support Help\ **Created:** [February 5, 2026, 5:54am UTC](https://community.retellai.com/t/i-am-having-issues-connecting-retell-with-plivo-for-inbound-calls-i/758 "2026-02-05T05:54:59Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![intern-srinivas](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/intern-srinivas/32/155_2.png) [@intern-srinivas](https://community.retellai.com/u/intern-srinivas)\ **Post date:** [February 5, 2026, 5:54am UTC](https://community.retellai.com/t/i-am-having-issues-connecting-retell-with-plivo-for-inbound-calls-i/758/1 "2026-02-05T05:54:59Z")
I am connecting my plivo number to retell ai i am able to make outbound calls but inbound calls are not working i have setup my origination uri correctly.please help ---
**Author:** ![support2](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/support2/32/15_2.png) [@support2](https://community.retellai.com/u/support2)\ **Post date:** [February 5, 2026, 5:55am UTC](https://community.retellai.com/t/i-am-having-issues-connecting-retell-with-plivo-for-inbound-calls-i/758/2 "2026-02-05T05:55:21Z")
For inbound calls through elastic SIP trunking, verify your origination configuration is set to Retell’s SIP server address: `sip:sip.retellai.com`[(1)](https://docs.retellai.com/deploy/custom-telephony). For toll-free numbers specifically, you need to specify the transport protocol: `sip:sip.retellai.com;transport=tcp`[(1)](https://docs.retellai.com/deploy/custom-telephony). Common issues to check when inbound calls aren’t working: **Origination Setting Verification** Ensure your origination SIP URI in Plivo points exactly to Retell’s server[(1)](https://docs.retellai.com/deploy/custom-telephony). The format matters—double-check there are no extra spaces or incorrect transport specifications[(1)](https://docs.retellai.com/deploy/custom-telephony). **Import Configuration** After setting up your SIP trunk in Plivo, you must import the number into Retell AI[(2)](https://www.retellai.com/blog/integrating-ai-with-sip-trunking-and-modern-telephony). During import, provide the termination SIP URI and any authentication credentials (username/password) if you configured credential-based auth instead of IP whitelisting[(2)](https://www.retellai.com/blog/integrating-ai-with-sip-trunking-and-modern-telephony). **Check Logs** Review your Plivo logs for any origination errors[(3)](https://discord.com/channels/1186424376300679209/1186462578310910112/1375533669619470396). One user reported seeing “ACK not received from your SIP endpoint” errors (32022) which indicated configuration issues[(3)](https://discord.com/channels/1186424376300679209/1186462578310910112/1375533669619470396). **Transport Method** Retell supports TCP (recommended), UDP, and TLS as transport methods[(1)](https://docs.retellai.com/deploy/custom-telephony). For TCP specifically, use: `sip:sip.retellai.com;transport=tcp`[(1)](https://docs.retellai.com/deploy/custom-telephony). If you’ve verified all settings and inbound still fails while outbound works, check that: - Your number is properly assigned to the elastic SIP trunk in Plivo - The origination URI exactly matches Retell’s specification - Your Plivo account has proper permissions for inbound routing ---
**Author:** ![intern-srinivas](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/intern-srinivas/32/155_2.png) [@intern-srinivas](https://community.retellai.com/u/intern-srinivas)\ **Post date:** [February 5, 2026, 5:56am UTC](https://community.retellai.com/t/i-am-having-issues-connecting-retell-with-plivo-for-inbound-calls-i/758/3 "2026-02-05T05:56:51Z")
how to configure on retell side ---
**Author:** ![support2](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/support2/32/15_2.png) [@support2](https://community.retellai.com/u/support2)\ **Post date:** [February 5, 2026, 5:57am UTC](https://community.retellai.com/t/i-am-having-issues-connecting-retell-with-plivo-for-inbound-calls-i/758/4 "2026-02-05T05:57:12Z")
On the Retell AI side, you need to import your Plivo number after setting up the elastic SIP trunk in Plivo[(1)](https://docs.retellai.com/deploy/custom-telephony). Here’s what you need to configure: **Import Your Number to Retell** Supply the termination SIP URI you configured in your Plivo elastic SIP trunk[(2)](https://docs.retellai.com/deploy/twilio). This is the URI Retell will use for outbound calls[(2)](https://docs.retellai.com/deploy/twilio). If you set up authentication via credentials in Plivo, you’ll need to provide the username and password when importing[(2)](https://docs.retellai.com/deploy/twilio)[(1)](https://docs.retellai.com/deploy/custom-telephony). **Two Ways to Import** 1. **Via Dashboard** : Access the Retell AI dashboard and navigate to the phone numbers section to import your number[(3)](https://www.retellai.com/blog/how-to-choose-the-right-telephony-system-in-2024) 2. **Via API** : Use the Import Number API programmatically[(2)](https://docs.retellai.com/deploy/twilio)[(1)](https://docs.retellai.com/deploy/custom-telephony) **What Happens After Import** Once the number is imported, it will show up in your Retell dashboard and you can make and receive calls with it just like a number purchased directly from Retell[(2)](https://docs.retellai.com/deploy/twilio)[(1)](https://docs.retellai.com/deploy/custom-telephony). You can make phone calls from the dashboard directly or use the Create Phone Call API to create calls programmatically[(2)](https://docs.retellai.com/deploy/twilio). **Key Configuration Details** When importing, you need to provide[(1)](https://docs.retellai.com/deploy/custom-telephony)[(3)](https://www.retellai.com/blog/how-to-choose-the-right-telephony-system-in-2024): - The termination SIP URI from your Plivo trunk - Username and password (if using credential-based authentication) - Any additional SIP headers required by your provider[(4)](https://docs.retellai.com/deploy/telnyx) If you need to change the configuration later, you’ll need to delete and re-import the number[(1)](https://docs.retellai.com/deploy/custom-telephony). \*\* ---
**Author:** ![intern-srinivas](https://yyz2.discourse-cdn.com/flex008/user_avatar/community.retellai.com/intern-srinivas/32/155_2.png) [@intern-srinivas](https://community.retellai.com/u/intern-srinivas)\ **Post date:** [February 5, 2026, 6:01am UTC](https://community.retellai.com/t/i-am-having-issues-connecting-retell-with-plivo-for-inbound-calls-i/758/5 "2026-02-05T06:01:39Z")
the call are stating user busy