The Singapore-based carrier on Monday announced a collaboration with Session Initiated Protocol (SIP) provider SIPphone to jointly offer the latter's services in the region.
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SIP, developed by the Internet Engineering Task Force, is a protocol that supports Internet telephone, video phone and instant-messaging services. In recent months, gear makers likeand have scaled up efforts to target businesses.
is a venture MP3.com and Lindows founder Michael Robertson started last August. It sells SIP-capable equipment on its Web site at prices starting at $75. A broadband connection is required, but calls made between SIPphone users are then free.
Through the deal with SingTel, which takes effect later this quarter, SIPphone owners will also be able to connect to SingTel's public switched telephone networks (PSTN), including mobile phones.
"We have worked closely with SIPphone to ensure a seamless and well-integrated user experience when dialing both SIP-to-PSTN and PSTN-to-SIP calls," Richard Tan, SingTel's vice president for international carrier services, said in a statement.
According to the company, non-SIP users who wish to make calls to SIP phones will have to connect via a Singapore-based access number and pay the standard local or international toll charges. Rates for making SIP-to-PSTN calls have yet to be determined.
Aloysius Choong of CNETAsia reported from Singapore.
Reuters contributed to this report.