# Show HN: Jamb AI - Voice Agents for Group Calls > Source: > Published: 2026-09-30 19:24:36+00:00 Sharat on X: "I'm Sharat, co-founder of Jamb (https://t.co/dqZaFg0OHJ, https://t.co/vrRoQ2fZDC) Jamb is a system of record for construction teams. 4 out of 5 US residential builders are made up of small teams (1-4 employees). The general contractor is often one person who runs the job from a truck, on calls all day. That person rarely stops to open a project tool and fill in a form. The data already exists. It sits inside the phone calls. So we put a voice agent in the calls and the group chats. Her name is Donna. She turns speech into tasks, a call summary and an attributed transcript. The record updates from the call, not from a form. She is also the AI receptionist on your business line. Thread (1/n): Demos from what we showed at Boston's Voice AI meetup. We show a three-way phone call where the agent listens quietly and speaks only when summoned. Three more demos show Donna managing tasks, recalling details from previous calls and chats, and acting as an interpreter. Event: https://t.co/NJsp78zbBo Slides: https://t.co/wH2Ols5vor" I'm Sharat, co-founder of Jamb (jamb.ai, crunchbase.com/organization/j…) Jamb is a system of record for construction teams. 4 out of 5 US residential builders are made up of small teams (1-4 employees). The general contractor is often one person who runs the job from a truck, on calls all day. That person rarely stops to open a project tool and fill in a form. The data already exists. It sits inside the phone calls. So we put a voice agent in the calls and the group chats. Her name is Donna. She turns speech into tasks, a call summary and an attributed transcript. The record updates from the call, not from a form. She is also the AI receptionist on your business line. Thread (1/n): Demos from what we showed at Boston's Voice AI meetup. We show a three-way phone call where the agent listens quietly and speaks only when summoned. Three more demos show Donna managing tasks, recalling details from previous calls and chats, and acting as an interpreter. Event: luma.com/gqxuajjg?tk=oj… Slides: docs.google.com/presentation/d… I'm Sharat, co-founder of Jamb (jamb.ai, crunchbase.com/organization/j…) Jamb is a system of record for construction teams. 4 out of 5 US residential builders are made up of small teams (1-4 employees). The general contractor is often one person who runs the job from a truck, on calls all day. That person rarely stops to open a project tool and fill in a form. The data already exists. It sits inside the phone calls. So we put a voice agent in the calls and the group chats. Her name is Donna. She turns speech into tasks, a call summary and an attributed transcript. The record updates from the call, not from a form. She is also the AI receptionist on your business line. Thread (1/n): Demos from what we showed at Boston's Voice AI meetup. We show a three-way phone call where the agent listens quietly and speaks only when summoned. Three more demos show Donna managing tasks, recalling details from previous calls and chats, and acting as an interpreter. Event: luma.com/gqxuajjg?tk=oj… Slides: docs.google.com/presentation/d… A standard voice-agent loop expects one user. A group call breaks it. In our first version, Donna heard herself through the phone and replied to herself. Without turn control, she also answered when two humans spoke to each other. Prompt instructions alone were not sufficient to Donna files a task from a live call, by voice. Nobody opens a form. It is a three-way video call inside the Jamb app. Donna is in the member list, same as the two of us. Crews share tasks. Donna knows who spoke, but keeps the task in the shared list. Seth's follow-up updates Donna recalls a past call, then reads a PDF dropped into the chat mid-call. I ask Donna what we decided on our previous call. She answers from that call's summary. She names the task it produced: "Prepare for meetup presentation", now In Progress. Then, still mid-call, I share On a jobsite, the crew and the GC do not always share a language. Donna interprets live. Interpreter mode replaces the translation app you pass back and forth. Both people speak naturally around one phone. She asks which two languages. Then she waits for each speaker to finish We are six people, one year into building Jamb, a system of record for construction teams. Donna, our voice agent, fills it from calls and group chats. Web: jamb.ai Crunchbase: crunchbase.com/organization/j… LinkedIn: linkedin.com/company/jamb-a… Install Jamb. Make a group.