Editing Vonage (section)

===Quality of service and equipment compatibility===
VoIP service relies upon consistent broadband-ISP uptime and VoIP-equipment compatibility with the ISP's modem. Although VoIP was initially optimized for voice, some [[fax]] equipment can be operated over VoIP,<ref>[http://www.voipmechanic.com/faxingissuesandotherdevices.htm Faxing Issues and Other Devices]. VoIPMechanic.com. Retrieved 2010-03-30.</ref><ref>{{Cite book |last1=Hanes, David |url=https://books.google.com/books?id=mmocBBbJaa0C&q=fax+problems+voip&pg=PA130 |title=Fax, Modem, and Text for IP Telephony |last2=Salgueiro, Gonzalo |publisher=Cisco Press |year=2008 |isbn=978-1-58705-269-9 |page=130}}</ref><ref>{{Cite book |last=Olejniczak, Stephen P |url=https://books.google.com/books?id=Og574PMpk8EC&q=fax+problems+voip&pg=PA170 |title=VoIP Deployment For Dummies |date=29 January 2009 |publisher=Wiley |isbn=9780470440056 |page=170}}</ref> but compatibility of monitored [[alarm device|alarm systems]] and other devices is less certain.<ref>{{Cite web |date=November 17, 2009 |editor-last=Jones |editor-first=Paul E. |title=SIP Forum – Fax Over IP Task Group Problem Statement |url=http://tools.ietf.org/html/draft-jones-sip-forum-fax-problem-statement-00 |access-date=2010-03-30 |website=IETF.org SIP Forum |editor-last2=Salgueiro |collaboration=yes |editor-first2=Gonzalo}}</ref> Vonage offers "specially commissioned" ''Fax Line'' service.<ref>{{Cite web |title=Vonage Business |url=http://www.vonage.com/ |access-date=2025-01-27 |website=Vonage.com |language=en}}</ref> Vonage recommends customers keep a basic traditional landline dedicated to their home alarm system and use Vonage for the rest of their calling needs.<ref>{{Cite news |title=Vonage Residential {{!}} Answer {{!}} Home Alarms and Medical Alert Devices |url=https://support.vonage.com/app/articles/answer/Home-Alarms-and-Medical-Alert-Devices-1075 |access-date=2025-01-27 |work=Vonage.com}}</ref>

Vonage implements [[Voice over IP]] sending audio via [[Real-time Transport Protocol|RTP]] and signaling via [[Session Initiation Protocol|SIP]].<ref>{{Cite web |title=PBX SIP Trunking Service Provider & Cloud Solution |url=https://www.vonage.com/business/quality-of-service/sip-trunking/ |access-date=2019-12-20 |website=Vonage.com |language=en}}</ref>