[incoming-alert]
exten => 8431234567,1,Goto(s,1)
exten => s,1,Set(GVACCT=acctname) ; your Google Voice account name without @gmail.com
exten => s,2,Set(GVPASS=password) ; your Google Voice account password
exten => s,3,Set(EMAIL_NOTIFY=yourname@gmail.com) ; Gmail address to receive Jabber alerts
exten => s,4,Set(SMS_NOTIFY=6782223344) ; your cellphone number to receive SMS alters
exten => s,n,Playtones(ring)
exten => s,n,JABBERSend(${GVACCT},${EMAIL_NOTIFY},"Incoming call: ${CALLERID(all)}")
exten => s,n,System(gvoice -e ${GVACCT}@gmail.com -p ${GVPASS} send_sms ${SMS_NOTIFY} "Incoming call: ${CALLERID(all)}")
exten => s,n,Goto(from-trunk,${CALLERID(dnid)},1)
exten => s,n,Hangup