Advertising Disclosure
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. By purchasing the products we rank, you’ll get the lowest price we found while we may receive a commission at no cost to you, which will help us continue to provide you with value.
Best Choice Grandstream 
Grandstream UCM6300A IP-PBX Phone System Supports up to 3000 usersExcelltel 
New Excelltel SOHO-PBX SP-208 (2 x 8) PABX Telephone Switch System Exchange 2 CO Lines x 8 Extensions,Automated Telephone SystemBest Value Grandstream 
Grandstream UCM6302 IP PBX 2FXO, 2FXS Appliance Supports up to 3000 users and up to 450 concurrent callsGrandstream 
Grandstream GXP1625 2 SIP Accounts HD Audio 2 Line IP Phone 2 SIP accounts, 2 line keys, 3-way conferencingCablesys 
Coiled Telephone Handset Cord for Use with PBX Phone Systems, VoIP Telephones - 12 Ft Uncoiled, Rj22, 1.5 Inch Lead on B 32 American Wire Gauge, AWG, stranded tinsel ribbon conductors to provide maximum flexibility and increased elastic memoYEASTAR 
Yeastar P550 IP PBX System Intuitive user interface for easy adoption and managementDOORLINE 
DOORLINE 150800 Classic Advancement of The T01/02. Power PBX/Router to Door Intercom, Expandable to Video Intercom, Whit Intercom and door opening via existing telephones or directly with the smartphone; further development of the Doorline /Cablesys Cablesys Coiled Telephone Handset Cord for Use with PBX Phone Systems, VoIP Telephones - 12 Ft Uncoiled, Rj22, 1.5 Inch 32 American Wire Gauge, AWG, stranded tinsel ribbon conductors to provide maximum flexibility and increased elastic memoPBX, VoIP, and Modern Digital Calling Systems: A Comprehensive Guide Grandstream Grandstream UCM6308 IP PBX Supporting Full-Band Opus Voice Codec Telephone System Zero configuration provisioning of SIP endpointsCablesys Cablesys Coiled Telephone Handset Cord for Use with PBX Phone Systems, VoIP Telephones - 12 Ft Uncoiled, Rj22, 1.5 Inch 32 American Wire Gauge, AWG, stranded tinsel ribbon conductors to provide maximum flexibility and increased elastic memo14% Off Panasonic Panasonic DECT Digital Cordless Phone with Built-in Answering Machine and 3 Handsets (KX-TG6823ALB) Black & Silver Noise Reduction - reduce the background noise of the other party when it's difficult to hear; simply by pressing the dedICC ICC Voice 8P2C Telco Patch Panel with 24 Ports, Rear Female Telco/Amphenol Connector, 1 RMS, 19-Inch Rack-Mounted Patch ENHANCED VOICE-GRADE NETWORK: Engineered for peak network performance, ICC's telco patch panel features 50 micro-inch goNortel Nortel M5316 Business Telephone Black (Nt4x42ca) 13 programmable line/feature keysPanasonic Panasonic DECT Digital Cordless Phone with Built-in Answering Machine and 1 Handset (KX-TG6821ALB), Black & Silver Noise reduction. Reduce the background noise of the other party. Suppresses background noise around the caller while simImage Audio iHold AP USB/SD On Hold Music Player - mp3 Music & Message on Hold Player for All PBX/KSU or Key System Telephones or An New Anti-flickering technology for cell phone callers on hold - Music and messages On Hold for all multi-line PBX /KSU pYealink Yealink Ultra-Elegant SIP-T48U Giagabit IP Phone - Black [SIP-T48U] 7" 800 x 480-pixel color touch screen with backlightThe VoIP Lounge The VoIP Lounge Replacement 9 Foot Black Handset Curly Cord for Yealink SIP Phone: T40P T41P T32G T38G T40G T42G T46G T4 9 Feet Fully Stretched, 15 Inches Coiled (See Full Description Below)The VoIP Lounge The VoIP Lounge Replacement Handset Receiver with 9 Foot Cord Black for Avaya IP Office 1400 and 1600 Series Phone 1403 Brand NewBuild IP Phone System with FreePBX: first step to freepbx (Japanese Edition) The VoIP Lounge The VoIP Lounge Replacement Wideband Handset Receiver with 9 Foot Cord for Cisco 7800 & 8800 Series IP Phone 7821 7841 7 New - Individually BoxedSenotrade Senotrade Replacement AC/DC Adapter Compatible for Model NO: DDU280060 VoicePro PBX Voice Pro VP 206 VP408 VP412 Small O World Wide Input Voltage 100-240VAC 50/60Hz.Barrel tip.The VoIP Lounge The VoIP Lounge Replacement 12 Ft Black Handset Curly Cord for Yealink SIP Phone 12 Feet Fully Stretched, 22 Inches Coiled (See Full Description Below)BT BT XD56 Trio Cordless Phones with Answering Machine and Nuisance Call Blocker The VoIP Lounge The VoIP Lounge Replacement Handset for Shoretel Mitel IP Phone 230 115 265 565 560 530 210 110 560G 230G 565G NewSetting Up a Grandstream VOIP Phone System The VoIP Lounge The VoIP Lounge Replacement Handset for Cisco 7900 Series Phone 7902 7905 7906 7910 7911 7912 7940 7941 7945 7960 7961 7 New - Individually BoxedThe VoIP Lounge The VoIP Lounge Replacement Handset for Avaya 9600 and 9500 Series IP Phone 9608 9610 9620 9620C 9621G 9630 9630G 9640 9 NewThe VoIP Lounge The VoIP Lounge Replacement HD Quality Handset for Shoretel IP Phone 420 480 480G 485 655 Black Brand NewThe VoIP Lounge The VoIP Lounge Replacement HD Voice Handset with Curly Cord for Polycom VVX Series IP Phones 300 301 310 311 400 401 41 New - Individually BoxedThe VoIP Lounge The VoIP Lounge Replacement Handset for Mitel 5300 Series IP Phones 5304 5312 5320 5320e 5324 5330 5330e 5340 5340e and Brand NewNEC SL2100 Desi Sheets-24B Tel (pkg 25) Q24-FR000000127820CreateSpace Independent Publishing Platform TCL VoicePro Installation and Programming VP206 & VP412: VoiceMail and Automated Attendant Programming/Installation Guid The VoIP Lounge The VoIP Lounge Replacement Handset for Cisco 6900 8900 9900 Series IP Phones 9951 9971 8941 8945 8961 6961 6945 6941 69 Brand NewThe VoIP Lounge The VoIP Lounge Replacement Handset Receiver for Toshiba DP5000 and IP5000 Series Phone Black DP5008 DP5022SD DP5122SD D NewThe VoIP Lounge The VoIP Lounge Replacement Handset with Curly Cord for Toshiba DKT-3000 Series Phone 3010-S 3010-SD 3020-S 3020-SD 3007 Brand NewThe Ultimate Guide To Launching A Modern Business Phone System Even If You're Not Tech Savvy: What Every Entrepreneur Ne The VoIP Lounge The VoIP Lounge Replacement 12 Foot Handset Receiver Curly Cord for Mitel IP 5000 Series Phones 5304 5312 5324 5320 5330 12 Feet Fully Stretched, 22 Inches Coiled (See Full Description Below)MKJ Corded RJ9 Office Phone Headset with Noise Cancelling Microphone Compatible with Plantronics Altigen Polycom Gigaset Ava SUPERB SOUND QUALITY: Headset with microphone is a necessity for those who want exceptional sound quality and freedom duThe VoIP Lounge The VoIP Lounge Replacement 25 Foot Black Long Handset Receiver Cord for Yealink SIP Phone T40P T41P T32G T38G T40G T42G 25 feet fully stretched, 3.5 feet coiled (See Description below)The VoIP Lounge The VoIP Lounge Replacement 9 Ft Handset Cord for Mitel 4000 Series Phone 4001 4015 4025 and 4150 9 Feet Fully Stretched, 15 Inches Coiled (See Full Description Below)The VoIP Lounge The VoIP Lounge Replacement 12 Foot Black Handset Receiver Cord for NEC DSX DTH DTP DTU DTL DTR ITR Series Phone 12' Fully Stretched, 22" Coiled (See Full Description Below)The VoIP Lounge The VoIP Lounge 12 Ft Black Handset Receiver Curly Cord for Grandstream GXP Series IP Phone 2170 2160 2140 2135 2130 176 12 Feet Fully Stretched, 22 Inches Coiled (See Full Description Below)The VoIP Lounge The VoIP Lounge Replacement 25 Foot Long Handset Receiver Cord for Mitel IP 5000 Series Phone 5304 5312 5324 5320 5330 5 25 feet fully stretched, 3.5 feet coiled (See Description below)For Dummies Asterisk For Dummies CRC Press Business Telecom Systems: A Guide to Choosing the Best Technologies and Services Used Book in Good ConditionO'Reilly Media Voip Hacks: Tips & Tools for Internet Telephony Auerbach Publications Computer Telephony Integration