Call Without Pickup

To call a telephone through the inbuilt speakerphone so the person does not have to pickup the phone to answer the call, use the following SIPAddHeader application before the dial command.

exten => 5555,1,SIPAddHeader(Call-Info:\;answer-after=0)
exten => 5555,n,SipAddHeader(Alert-Info: Ring Answer)
exten => 5555,n,Dial(SIP/201)
exten => 5555,n,HangUp

I have tested this with Linksys and Polycom Phones.

NOTE: For Polycom phone to work you will need to edit the default sip.cfg file and include the additional parameters.

voIpProt.SIP.alertInfo.2.value="Ring Answer" voIpProt.SIP.alertInfo.2.class="4"

You will need to add the above entries into the section alertInfo and append them after the alertInfo.1 entries.