Call transfer, blind or attended
Pass a caller to a colleague in one step, or speak to the colleague first and then join the calls. Both work on the Mac and on iPhone and iPad.
Shown with demo accounts and sample numbers.
Blind transfer
During a call, choose Transfer, enter the destination number and confirm. SIPdia asks the server to send the caller there and your call ends. Use it when you know the destination is right and the caller does not need an introduction.
Attended transfer
- Put the first call on hold with Hold, or start a new call with Add call; SIPdia holds the first call automatically.
- Call the destination and speak to them.
- Choose Transfer and pick the held call. The server connects the two parties and both of your calls end.
Use it when the caller should be announced, or when you want to check that the destination is available before handing over.
What the server needs
SIPdia performs transfers with the SIP REFER method (RFC 3515), with a Replaces header for attended transfers (RFC 3891). PBXs such as Asterisk, Issabel and FreePBX support both. Some hosted providers restrict REFER; if a transfer fails with an error from the server, that is the first thing to ask about.
Good to know
- Transfer is available on every account and in the free plan.
- Transfers to external numbers depend on the PBX's outbound routes and permissions.
- Recordings stop when your side of the call ends; the transferred call is not recorded by SIPdia.
Frequently asked questions
What is the difference between blind and attended transfer?
A blind transfer sends the caller straight to a number without speaking to the destination first. An attended transfer puts the caller on hold, calls the destination, lets you talk, and then joins the two calls.
Why does transfer fail on my provider account?
Transfer relies on the SIP REFER method, which the server must accept. Most PBXs do; some SIP providers do not allow REFER from a softphone. Ask the provider, or transfer from the PBX instead.
Does transfer need SIPdia Premium?
No. Blind and attended transfer are included in the free plan.
Can I transfer a call to another account's contact?
You transfer to a number as dialed by the account that holds the call. The destination can be any number the server can route, including extensions on the same PBX and external numbers if the PBX allows it.
Get SIPdia for your Mac, iPhone or iPad
Bring the SIP account you already have. The Mac and iPhone apps are in release preparation; download links appear on the download page when each release is live.
