Enable Pipecat self-hosted agent on LiveKit transport to receive DTMF from the other participant from inbound SIP trunks

[zhuoyanli-usm]

pipecat version

1.0.0

Python version

3.13

Operating System

No response

Question

Hello, I am building a voice agent service in the following setup:

• The voice agent, built with Pipecat framework 1.0.0, is self-hosted with LiveKit service transport
• I have the LiveKit server and LiveKit SIP server in place
• In-bound calls, from PSTN and through Twilio elastic SIP trunks, reach LiveKit SIP server
• They are further dispatched to rooms run by LiveKit server, and speak to voice agent instances there

My question is: Is it possible to get the voice agent to receive DTMF tone inputs from in-bound callers?

I can see that it is possible with DTMFAggregator, when pipecat agent runs on websocket transport, and with on_dtmf_event when runs on Daily transport. But I am not sure if with LiveKit transport it is also possible, i.e. using DTMFAggregator again?

On the other hand, I had looked at LiveKit's docs, and it seems that event callbacks need to be registered with the room instance to receive DTMF input (from the in-bound callers on SIP):
https://docs.livekit.io/telephony/features/dtmf/#dtmf-received-event

So maybe I need to

• make the voice agent register event callback on this event, to monitor DTMF inputs from the in-bound callers on SIP truanks
• when the event callback is triggered, proceed accordingly.

Any insights or advises are highly appreciated.

What I've tried

No response

Context

No response