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SIP based VoIP and IM Service Providers.
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Simwood eSMS - Provides UK phone number SIP termination for ISPs, ITSPs, call centres, calling card providers, and carriers. Endstream Communications - Provides wholesale US SIP termination and US DID origination. NexVortex - SIP Trunking, hosted PBX, and carrier offload services to small and medium businesses. Toll-Free SIP trunking and disaster/fail-over solutions available. GetOnSIP - Provides free SIP addresses and softphone configuration instructions. Enterprise Communications Center - SIP trunking and business VoIP solutions. Site contains white papers and webinars. Voiceflex - Offers SIP trunking, data, and hosted telephony solutions. UK based. SIPSaver - SIP trunking solution. FAQ and support pages. SIP Sorcery - A combined SIP service and web application that can manage SIP devices and SIP providers. Flowroute - SIP only carrier offering wholesale VoIP solutions. SMS messaging platform and developer API integration. Supports G.729 audio codec. Guides available for interconnection. EtherSpeak - Offers IP based telecommunication solutions: SIP trunking, and IP PBX backup solutions. Internet faxing using store-and-forward HTTPS faxing with Audiocodes ATA adapters with T.38 support. VoIP Innovations - Wholesale VoIP DID, Origination, Termination and E911 service provider. "Backoffice" platform offers inventory management, CRM and least cast routing via underlying SIP carriers. CoreDial - White label SaaS platform enables Channel Partners to successfully sell, deliver, manage, and invoice for cloud SIP communications services. Partner programs for MSP, VAR, and ITSPs. T38Fax - T.38 Fax Over IP (FoIP) service. Offers T.38 SIP trunk origination and termination, as well as service provider fax offload. ECM Self-test, with PBX and device configuration guides available. SIPTrunk - A fully automated , white label B2B SIP Trunk provider. Offers store-and-forward HTTPS fax. PBX configuration guides, and SIP trunk education resources available. DIDforSale - Wholesale SIP trunking provider offering low-cost DID origination and termination. Site offers multiple interconnection guides for most popular PBX systems. SIP.us - SIP trunk provider offering quick SIP trunk configuration and flexible billing platform. Custom module available for easy integration for FreePBX. Xinix World - B2B and B2C services for SIP Trunking, DID, Hosted PBX, and additional VoIP services. VoIPAccess - B2C oriented Voice over IP (VoIP) provider. Flat rate internet phone service, online account management and VoIP tools available. AltoTelecom - UK Based SIP service provider serving businesses and call centers & offering unlimited concurrent call paths. Free US-based virtual phone number with every account.
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