Twilio SIP

SIP REFER fix: Vapi connected to PBX via Twilio. · Check why Twilio intercepting/dropping REFER message instead of passing it to PBX. · Configure SIP Pass-through or adjust TwiML/Bin. · If final carrier doesn't support REFER, help switch re-INVITE bridge. · ...

We're building an AI outbound calling system at high volume. We have the AI/LLM engineer (voice agent + conversation logic). I need a senior telephony expert to design and implement the carrier-safe outbound telephony layer: SIP trunking, routing, rotation, pacing, and monitoring ...

We're looking for an experienced Voice / Telephony Engineer to help us stabilize and complete an AI-driven call center integration. · This is not a generic chatbot project. The AI layer already exists. The challenge is at the telephony and call-flow level: SIP, inbound/outbound c ...

We need an expert to configure our existing Twilio phone line to work with Bria Solo softphones for two users (one in NC, one in Ecuador). · What's Already Done: · Twilio SIP Domain created and configured · Phone number pointing to SIP infrastructure · SIP credentials created · B ...

We are seeking an experienced Telephony Systems Engineer to help us troubleshoot a retro-style Wi-Fi enabled landline running on a 3rd party VOIP infrastructure. We have completed a 3-month pilot with 17 users running on our v1 architecture: off-the-shelf ATA devices configured o ...

We are looking for a skilled freelancer to assist in consolidating our phone numbers from Vonage to Twilio. This project involves setting up a Twilio-generated SIP to support existing hardphones during the transition. · Twilio integrations and SIP configurations. · ...

Need someone to finalise a BYOC setup: Twilio (AU1) + Crazytel + GoHighLevel. · ...

Small mortgage company looking for an experienced Twilio developer to set up two inbound phone numbers. · The goal is to filter out spam on the public line while providing direct access on my private line. · Both lines must fall back to an AI voice assistant (SynthFlow) via SIP t ...

Looking for an experienced Twilio Voice consultant for ongoing advisory work, 5-7 hours per week. · We run a production Twilio Voice application handling inbound and outbound calls across multiple countries. We need someone who can help with configuration, troubleshooting, intern ...

We are seeking a senior-level 3CX engineer with recent, hands-on v20 experience to assist with advanced configuration and migration tasks. · We operate a high-volume production 3CX v20 system integrated with Twilio SIP trunking and redundant infrastructure (AWS + Vultr). ...

We need an experienced Twilio specialist to set up our business phone number in Twilio as soon as possible. · ...

I'm looking for an experienced telecom / Twilio developer to build a ringless voicemail drop system. · This is not a standard outbound dialer. I need a true ringless voicemail (RVM) setup that can deposit voicemail messages without ringing the recipient's phone. · Scope: · • Set ...

I'm looking for someone with hands-on experience connecting Retell AI to a personal mobile number in Kuwait. · This is not theoretical work. I need someone who has actually done SIP / telephony routing in Kuwait or understands how to work around local telecom restrictions.Connect ...

+Job summary · An experienced AI Engineer is needed to help build AI voice agents that can intelligently navigate IVR systems. · +Responsibilities · * Build AI voice agents that interact with IVR menus and phone systems · * Handle interruptions (barge-in, silence, retries, droppe ...

We want a durable AI-first sales system across Canada and the United States that combines: ...

Hi · One of my client is traveling around the world and need cheap calling system in his phone to call his home country back. · So just checking if SIP OR VoIP or twilio alike any of the platform has such features to do outbound or inbound call to India ? · If yes, please suggest ...

We are building two sophisticated AI voice agents for an Australian solar & electrical company using Retell AI, OpenAI GPT-4o,n8n workflows,Simpro CRM,Microsof Graph API,Twilio telephony. · Australian female voice persona using OpenAI GPT-4o · Real-time caller ID lookup via Simpr ...

We are building VoCo, a hybrid AI interpreting app. The Frontend (FlutterFlow) is hired. We need a Senior Backend Architect to build the audio engine and integrations. · Set up Twilio Media Streams to stream audio to Gemini 2.5 Flash Native Audio via the Live API · ...

This role involves building live AI outbound calling systems using telecom first real time voice engineering. You will place outbound SIP calls stream audio in and out in real time detect humans versus voicemail run speech to text LLM and text to speech during live calls hang up ...

+Job summary · We're looking for a senior-level SIP Trunking & VoIP engineer to help us set up and stabilize outbound and inbound calling for an AI calling platform (Retell AI). · This is not a beginner role. We need someone who understands real-world VoIP challenges and can deli ...