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A SIP provider (Session Initiation Protocol) is any telecommunications company which provides SIP trunking to customers, usually businesses. Many companies provide SIP "termination" (outbound calling) and "origination" (inbound calling, usually with a plain old telephone service (POTS) phone number, called a direct inward dialing (DID).
SIP trunking is a voice over Internet Protocol (VoIP) technology and streaming media service based on the Session Initiation Protocol (SIP) by which Internet telephony service providers (ITSPs) deliver telephone services and unified communications to customers equipped with SIP-based private branch exchange (IP-PBX) and unified communications facilities. [1]
Intertex SIP transparent routers, firewalls and ADSL modems, for broadband deployments and SOHO market; Juniper Networks Netscreen and SRX firewalls include complete SIP Application Layer Gateway support; Linux Netfilter's SIP conntrack helper fully understands SIP and can classify (for QOS) and NAT all related traffic; Netopia Netopia supports ALG
Services using SIP-I include voice, video telephony, fax and data. SIP-I and SIP-T [29] are two protocols with similar features, notably to allow ISUP messages to be transported over SIP networks. This preserves all of the detail available in the ISUP header. [a] SIP-I was defined by the ITU-T, whereas SIP-T was defined by the IETF. [30]
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Globe was the first foreign company to be granted entry into the Philippine's liberalized market. In 1994, Globe launched its digital cellular services, pioneering the use of Global System for Mobile Communications Technology . In fact, Globe popularized the short messaging service (SMS) through adding it for free with their basic services.
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Retail customers of an ITSP may use traditional analog telephone sets attached to an analog telephony adapter (ATA) to connect to the service provider's network via a local area network, they may use an IP phone, or they may connect a private branch exchange (PBX) system to the service via media gateways.