What's the different between OTT and IPTV

<Original: quora.com  & wikipedia.org>

IPTV delivers television content using signals based on the Internet protocol (IP), through the open, unmanaged Internet with the "last-mile" telecom company acting only as the Internet service provider (ISP). As described above, "Internet television" is "over-the-top technology" (OTT). Both IPTV and OTT use the Internet protocol over a packet-switched network to transmit data, but IPTV operates in a closed system—a dedicated, managed network controlled by the local cable, satellite, telephone, or fiber-optic company.

In comparison, OTT (over-the-top) video services use the publicly accessible Internet to deliver video streams. Such content is not just available via set-top-boxes, but also via any devices that can access the Internet – such as phones, tablets and smart TVs with a broadband connection. Popular OTT services include Netflix and Hulu. 

At the end of the day operators can choose between IPTV and OTT or decide for the combination of both. Below are some the key differences:

Comparison Category	OTT ( Over the Top)	IPTV ( Internet Protocol TV)
Content Delivery	Uses open internet, un-managed network.  Open ecosystem	Uses dedicated, managed network.  Walled garden ecosystem
Network Type	Delivered from content provider / aggregator  to the viewer using open network. Usage of  CDN	Closed, proprietary network,  accessed via a specific internet  service provider
Network Relationship	Without the need for intervening carriage  negotiations, or infrastructure investments	Services are delivered on optimized  and custom high bandwidth network
Service Examples	Popular Video on Demand services like  YouTube, Netflix, Amazon LoveFilm, Hulu,  Sky Go, BBC iPlayer etc.	IPTV services like U-Verse (AT&T),  Prism TV (CenturyLink)
Delivery Protocol	Delivered over HTTP / TCP, a connected  transport protocol. Movement towards  adaptive streaming technologies HLS  (Apple), Smooth Streaming (MS)  and HDS (Adobe)	IPTV uses Transport Stream (TS)  transmission technology. Uses RTP  (Real time protocol) over UDP, a  connectionless protocol
Content Catalog	Widely used for freemium and economical  subscription VOD	Used primarily for premium VOD  and real time content delivery like  broadcast TV
Routing Topology	Unicast (HTTP), Simulated Multicast  (UDP/TCP)	Multicast. Initial unicast burst during  channel change leading to Multicast  join
Service Category	Complementary Service	Main service, similar to Satellite/ Cable TV services
Major Platform Players	OVP (Online Video Platforms) like Kaltura,  Brightcove, CDN Players like Akamai, L3,  Limelight, Cloud Service Providers like  Amazon	TSP ( Telecom Service Providers)  and IPTV platform vendors -  Microsoft Mediaroom ( now Ericsson),  ALU, Cisco
Key Benefits	Low cost, flexible model, Easy to manage  and operate	High quality of service and quality of  experience. Monitoring and control,  interactive services

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