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what is the return value of transfer_sip_participa...
# ask-ai
l
what is the return value of transfer_sip_participant. How to know if the transfer was successful?
t
Thanks for reaching out, Deepak. I'm an AI assistant and I'm here to help. Give me a moment while I research this topic.
Hey there! Just a quick heads-up about the return value of 
transfer_sip_participant
— it varies depending on the SDK you’re working with: • Python SDK: You’ll get back a 
SIPParticipantInfo
. • Node.js SDK: It returns a 
Promise<void>
. • Go Service: You’ll see a 
*emptypb.Empty
returned. Wondering how to check if the transfer actually went through? Here’s a simple way: • Keep an eye out for any exceptions or errors. If nothing pops up, that means your transfer request was successfully kicked off. • If you’re using Python, you can attach a callback to the returned 
Future
to catch whether it succeeded or ran into issues. • Also, logging success messages is a handy way to confirm that the transfer got started. Just a little thing to keep in mind: even if the API call says the transfer request was successful, the final outcome depends on whether your SIP provider supports SIP REFER functionality. So, fingers crossed it all goes smoothly! Sources: livekit-api/livekit/api/sip_service.py | examples/voice_agents/error_callback.py | packages/livekit-server-sdk/src/SipClient.ts | pkg/service/sip.go | agent.py
l
I am using python SDK
t
Hey there! When you use the Python SDK, the 
transfer_sip_participant
method gives you a 
SIPParticipantInfo
object. To check if the transfer went through smoothly, you can handle exceptions like this:
Copy code
try:
    await livekit_api.sip.transfer_sip_participant(transfer_request)
    print("Transfer successful")
except Exception as e:
    print(f"Transfer failed: {e}")
If you don’t see any exceptions, that means the transfer request kicked off just fine. Feel free to reach out if you want me to walk you through anything else!
l
Sometimes, the transfer-target doesn't pick the call. Even in such case, sometimes, the exception is not thrown
t
Sometimes, when the person you're transferring the call to doesn’t pick up, the 
transfer_sip_participant
method might still show as successful because it just means the system accepted the transfer request. Whether the call actually goes through depends on how your SIP provider handles the transfer and if the target answers. To make sure everything’s working smoothly, you might want to add some extra checks to keep an eye on the call status or use SIP signaling events (if your system supports them) to confirm if the transfer really went through or if the call was answered. If you'd like, I’m here to help you set that up!
l
yes. please help in setup
t
Hey there! To keep an eye on call state and transfer completion using the Python SDK, here are some friendly tips you can try out: • Keep an Eye on Participant Attributes: You can check the 
sip.callStatus
attribute to see if the call is 
active
, 
ringing
, or 
hangup
. For example:
Copy code
call_status = participant.attributes.get("sip.callStatus")
if call_status == "active":
    print("Call is active")
• Set Up Event Listeners: This lets you catch real-time updates when participant attributes change:
Copy code
async def on_participant_attributes_changed(changed_attributes, participant):
    if 'sip.callStatus' in changed_attributes:
        print(f"Call status updated: {changed_attributes['sip.callStatus']}")

ctx.room.on("participant_attributes_changed", on_participant_attributes_changed)
• Use SIPTransferInfo: This gives you detailed info about transfers, including status and any errors. • Watch Analytics Events: Keep track of events like 
SIP_TRANSFER_REQUESTED
and 
SIP_TRANSFER_COMPLETE
to stay updated on transfer progress. • Try Callback Functions: Add a callback to handle when a transfer finishes, like this:
Copy code
def on_sip_transfer_done(f):
    if f.exception():
        print(f"Transfer failed: {f.exception()}")
    else:
        print("Transfer successful")

ctx.transfer_sip_participant(participant, "tel:+18003310500").add_done_callback(on_sip_transfer_done)
If you want, I’m here to help you set any of this up—just let me know! Sources: Making calls using SIP | LiveKit Docs | telephony/sip_lifecycle.py | livekit-protocol/livekit/protocol/analytics.pyi | examples/warm-transfer/warm_transfer.py | test/integration/sip_test.go
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