1. 2007. RFC5009: Private Header (P-Header) Extension to the Session Initiation Protocol (SIP) for Authorization of Early Media. 2007. RFC5009: Private Header (P-Header) Extension to the Session Initiation Protocol (SIP) for Authorization of Early Media.
2. 2015. "Largest IRS Phone Scam Likely Exceeded 450 000 Potential Victims in March". https://www.pindrop.com/irs-phone-scam-live-call_ analysis/. 2015. "Largest IRS Phone Scam Likely Exceeded 450 000 Potential Victims in March". https://www.pindrop.com/irs-phone-scam-live-call_ analysis/.
3. 2015. RFC7462:URNs for the Alert-Info Header Field of the Session Initiation Protocol (SIP). 2015. RFC7462:URNs for the Alert-Info Header Field of the Session Initiation Protocol (SIP).
4. 2015. Voice over LTE. http://www.gsma.com/technicalprojects/volte. 2015. Voice over LTE. http://www.gsma.com/technicalprojects/volte.
5. 2016. Google Phone App. https://play.google.com/store/apps/details? id=com.google.android.dialer. 2016. Google Phone App. https://play.google.com/store/apps/details? id=com.google.android.dialer.