购买 Internet-based Telephone Systems

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$79.99
Ooma Telo Voip Free Internet Home Phone Service. Affordable Landline Replacement. Unlimited Nationwide Calling. Call On The Go With Free Mobile App.
Amazon.com
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Ooma Telo Voip Free Internet Home Phone Service. Affordable Landline Replacement. Unlimited Nationwide Calling. Call On The Go With Free Mobile App.
Amazon.com
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$149.99
Ooma Telo Voip With 3 HD3 Handsets Complete Home Phone System For Unlimited Nationwide Calling, Mobile App Access, And Robocall Blocking Affordable
Amazon.com
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$149.99
Ooma Telo Voip With 3 HD3 Handsets Complete Home Phone System For Unlimited Nationwide Calling, Mobile App Access, And Robocall Blocking Affordable
Amazon.com
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$110.55
$129.99
Ooma Telo Voip Free Internet Home Phone Service And HD3 Handset. Affordable Landline Replacement. Unlimited Nationwide Calling. Call On The Go With
Amazon.com
795
Free shipping
折扣 14%
$110.55
$129.99
Ooma Telo Voip Free Internet Home Phone Service And HD3 Handset. Affordable Landline Replacement. Unlimited Nationwide Calling. Call On The Go With
Amazon.com
795
$90.99
Ooma Telo Voip Reliable Home Phone Solution With Unlimited Nationwide Calls, Mobile App Accessibility, And Robocall Blocking
Amazon.com
Free shipping
$90.99
Ooma Telo Voip Reliable Home Phone Solution With Unlimited Nationwide Calls, Mobile App Accessibility, And Robocall Blocking
Amazon.com
Free shipping
$273.72
Cisco IP Phone 8851 - Voip Phone - SIP, RTCP, RTP, SRTP, SDP - 5 Lines - Charcoal - CP-8851-3PCC-K9=
Hummingbird Networks USA
$273.72
Cisco IP Phone 8851 - Voip Phone - SIP, RTCP, RTP, SRTP, SDP - 5 Lines - Charcoal - CP-8851-3PCC-K9=
Hummingbird Networks USA
$129.99
Ooma Telo Air And Handset. Free Internet Home Phone Service Wi-Fi Connectivity. Affordable Landline Replacement. Unlimited Nationwide Calling. Mobile
Amazon.com
Free shipping
$129.99
Ooma Telo Air And Handset. Free Internet Home Phone Service Wi-Fi Connectivity. Affordable Landline Replacement. Unlimited Nationwide Calling. Mobile
Amazon.com
Free shipping
$115.58
Cisco IP Phone 7821 - Voip Phone - SIP, SRTP - 2 Lines - CP-7821-3PCC-K9=
Hummingbird Networks USA
$115.58
Cisco IP Phone 7821 - Voip Phone - SIP, SRTP - 2 Lines - CP-7821-3PCC-K9=
Hummingbird Networks USA
$41.89
$146.53
Ooma Telo Voip Home Office Phone System. Free Internet Phone Service With Business Desk Phone. Affordable Landline Replacement. Unltd Nationwide Calling. Call On The Go With Free Mobile App.
amazeprice.com
折扣 71%
$41.89
$146.53
Ooma Telo Voip Home Office Phone System. Free Internet Phone Service With Business Desk Phone. Affordable Landline Replacement. Unltd Nationwide Calling. Call On The Go With Free Mobile App.
amazeprice.com
$140.54
Cisco Desk Phone 9841 - Voip Phone - With Trusted Platform Module (TPM) 2.0 With Caller ID/Call Waiting - SIP, SDP, RTCP, RTP, SRTP - 4 Lines - Carbon
Hummingbird Networks USA
$140.54
Cisco Desk Phone 9841 - Voip Phone - With Trusted Platform Module (TPM) 2.0 With Caller ID/Call Waiting - SIP, SDP, RTCP, RTP, SRTP - 4 Lines - Carbon
Hummingbird Networks USA
$163.83
Cisco IP Phone 7841 - With Multiplatform Phone Firmware - Voip Phone - SIP - 4 Lines - TAA Compliant - CP-7841-3PCC-K9=
Hummingbird Networks USA
8
$163.83
Cisco IP Phone 7841 - With Multiplatform Phone Firmware - Voip Phone - SIP - 4 Lines - TAA Compliant - CP-7841-3PCC-K9=
Hummingbird Networks USA
8
$982.73
Cisco 8744 IP Phone - Wi-Fi - Built-In Camera - Black - Voip - IEEE 802.11A/B/G/N - SLINK-8744-NA=
Hummingbird Networks USA
$982.73
Cisco 8744 IP Phone - Wi-Fi - Built-In Camera - Black - Voip - IEEE 802.11A/B/G/N - SLINK-8744-NA=
Hummingbird Networks USA
$149.00
Poly Edge E350 IP Desk Phones (Plantronics + Polycom) - Easy To Install With Included Wi-Fi - 8-Line Keys Supporting Up To 32 Lines - Integrated
Amazon.com
Free shipping
$149.00
Poly Edge E350 IP Desk Phones (Plantronics + Polycom) - Easy To Install With Included Wi-Fi - 8-Line Keys Supporting Up To 32 Lines - Integrated
Amazon.com
Free shipping
$36.83
$48.19
Ooma Telo Voip Free Internet Home Phone Service With 3 HD3 Handsets. Affordable Landline Replacement. Unlimited Nationwide Calling. Answering Machine. Option To Block Robocalls.
jmpropiedadca
Free shipping
折扣 23%
$36.83
$48.19
Ooma Telo Voip Free Internet Home Phone Service With 3 HD3 Handsets. Affordable Landline Replacement. Unlimited Nationwide Calling. Answering Machine. Option To Block Robocalls.
jmpropiedadca
Free shipping
$179.99
Grandstream Unified Communications IP PBX And Networking System With Wi-Fi - GCC6010W
IP Phone Warehouse
$179.99
Grandstream Unified Communications IP PBX And Networking System With Wi-Fi - GCC6010W
IP Phone Warehouse
$358.75
Yealink IP Phone W73P Bundle Of W70B Base And W73H Handset + 2-Unit W73H Handset
Amazon.com
Free shipping
$358.75
Yealink IP Phone W73P Bundle Of W70B Base And W73H Handset + 2-Unit W73H Handset
Amazon.com
Free shipping
$104.20
Cisco IP Phone 7811 - With Multiplatform Phone Firmware - Voip Phone - SIP, SRTP - Charcoal - CP-7811-3PW-NA-K9=
Hummingbird Networks USA
$104.20
Cisco IP Phone 7811 - With Multiplatform Phone Firmware - Voip Phone - SIP, SRTP - Charcoal - CP-7811-3PW-NA-K9=
Hummingbird Networks USA
$165.99
Ooma Telo Voip Residential Phone Service And HD3 Handset, Black (TELOHD3)
Staples
795
$165.99
Ooma Telo Voip Residential Phone Service And HD3 Handset, Black (TELOHD3)
Staples
795
$79.99
Ooma Telo Voip Phone System (Black, $50 International Calling Credit) OOMA TELO
B&H Photo-Video-Pro Audio
78
$79.99
Ooma Telo Voip Phone System (Black, $50 International Calling Credit) OOMA TELO
B&H Photo-Video-Pro Audio
78
$106.99
Ooma Home Office 2-Line VOIP Phone Bundle With Digital Answering, Black (HMOFBNDL)
Staples
$106.99
Ooma Home Office 2-Line VOIP Phone Bundle With Digital Answering, Black (HMOFBNDL)
Staples
$139.04
Cisco IP Phone 6861 - Voip Phone - IEEE 802.11N (Wi-Fi) - SIP, SRTP - 4 Lines - CP-6861-3PW-NA-K9=
Hummingbird Networks USA
$139.04
Cisco IP Phone 6861 - Voip Phone - IEEE 802.11N (Wi-Fi) - SIP, SRTP - 4 Lines - CP-6861-3PW-NA-K9=
Hummingbird Networks USA
$123.96
Cisco IP Phone 6851 - Voip Phone - SIP, SRTP - 4 Lines - Charcoal - CP-6851-3PW-NA-K9=
Hummingbird Networks USA
$123.96
Cisco IP Phone 6851 - Voip Phone - SIP, SRTP - 4 Lines - Charcoal - CP-6851-3PW-NA-K9=
Hummingbird Networks USA
$55.40
$78.88
Ooma Telo Voip Free Internet Home Phone Service With 3 HD3 Handsets. Affordable Landline Replacement. Unlimited Nationwide Calling. Answering Machine. Option To Block Robocalls.
SHOP BRIGHT
折扣 29%
$55.40
$78.88
Ooma Telo Voip Free Internet Home Phone Service With 3 HD3 Handsets. Affordable Landline Replacement. Unlimited Nationwide Calling. Answering Machine. Option To Block Robocalls.
SHOP BRIGHT
$229.49
Cisco IP Phone 8841 - Voip Phone - SIP, RTCP, RTP, SRTP, SDP - 5 Lines - CP-8841-3PCC-K9=
Hummingbird Networks USA
$229.49
Cisco IP Phone 8841 - Voip Phone - SIP, RTCP, RTP, SRTP, SDP - 5 Lines - CP-8841-3PCC-K9=
Hummingbird Networks USA
$30.68
$39.95
Ooma Phone Genie Voip Internet Home Phone Service
Walmart
折扣 23%
$30.68
$39.95
Ooma Phone Genie Voip Internet Home Phone Service
Walmart
$356.12
CP-8841-K9= Cisco 8841 IP Phone 5 Line Gigabit, Color
Hummingbird Networks USA
5
$356.12
CP-8841-K9= Cisco 8841 IP Phone 5 Line Gigabit, Color
Hummingbird Networks USA
5
$620.59
Cisco 6825 IP Phone - Cordless - Cordless - DECT, Bluetooth - Wall Mountable, Surface Mount - 2 X Total Line - Voip - 2" LCD - CP-6825-3PC-BUN-CE
Hummingbird Networks USA
$620.59
Cisco 6825 IP Phone - Cordless - Cordless - DECT, Bluetooth - Wall Mountable, Surface Mount - 2 X Total Line - Voip - 2" LCD - CP-6825-3PC-BUN-CE
Hummingbird Networks USA
$92.99
Grandstream Wi-Fi Wireless IP Phone - WP822
IP Phone Warehouse
$92.99
Grandstream Wi-Fi Wireless IP Phone - WP822
IP Phone Warehouse
$398.68
Cisco IP Phone 8841 - Voip Phone - SIP, RTCP, RTP, SRTP, SDP - 5 Lines - TAA Compliant - CP-8841-3PCC-K9++=
Hummingbird Networks USA
$398.68
Cisco IP Phone 8841 - Voip Phone - SIP, RTCP, RTP, SRTP, SDP - 5 Lines - TAA Compliant - CP-8841-3PCC-K9++=
Hummingbird Networks USA
$341.06
Cisco IP Phone 8861 - Voip Phone - IEEE 802.11A/B/G/N/Ac (Wi-Fi) - SIP, RTP, SDP - 5 Lines - Charcoal - CP-8861-3PW-NA-K9=
Hummingbird Networks USA
$341.06
Cisco IP Phone 8861 - Voip Phone - IEEE 802.11A/B/G/N/Ac (Wi-Fi) - SIP, RTP, SDP - 5 Lines - Charcoal - CP-8861-3PW-NA-K9=
Hummingbird Networks USA
$395.00
CP-8821-K9 Cisco Cordless Voip IP Phone Unified 8800 Series
ServerOrbit.com
Free shipping
$395.00
CP-8821-K9 Cisco Cordless Voip IP Phone Unified 8800 Series
ServerOrbit.com
Free shipping
$72.99
Grandstream Wi-Fi IP Phone - WP810
IP Phone Warehouse
$72.99
Grandstream Wi-Fi IP Phone - WP810
IP Phone Warehouse
$167.95
Grandstream GXV3350 IP Video Phone | 16 Lines, 16 SIP Accounts | 5-Inch Color Touch Screen | 802.11N Wi-Fi | Dual-Port Gigabit Ethernet With
Amazon.com
Free shipping
$167.95
Grandstream GXV3350 IP Video Phone | 16 Lines, 16 SIP Accounts | 5-Inch Color Touch Screen | 802.11N Wi-Fi | Dual-Port Gigabit Ethernet With
Amazon.com
Free shipping
$44.99
Fanvil 4-Line Wi-Fi IP Phone - X303W
IP Phone Warehouse
$44.99
Fanvil 4-Line Wi-Fi IP Phone - X303W
IP Phone Warehouse
$118.99
Grandstream Wi-Fi IP Phone - WP836
IP Phone Warehouse
9
$118.99
Grandstream Wi-Fi IP Phone - WP836
IP Phone Warehouse
9
$72.69
$260.34
Ooma Telo Voip Free Internet Home Phone Service And HD3 Handset. Affordable Landline Replacement. Unlimited Nationwide Calling Telo Voip Free Internet Home Phone Service With 3 HD3 Handsets
fiapop.com
折扣 72%
$72.69
$260.34
Ooma Telo Voip Free Internet Home Phone Service And HD3 Handset. Affordable Landline Replacement. Unlimited Nationwide Calling Telo Voip Free Internet Home Phone Service With 3 HD3 Handsets
fiapop.com
$163.49
Ooma Telo IP Access Point Home Phone Service Bundle With 3 HD3 Cordless Handsets And Premier Subscription, Black (TELO3HD3)
Staples
958
$163.49
Ooma Telo IP Access Point Home Phone Service Bundle With 3 HD3 Cordless Handsets And Premier Subscription, Black (TELO3HD3)
Staples
958
The Evolution of Voice Over IP (VoIP)
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YouTubeCableSupply.com
The Evolution of Voice Over IP (VoIP)
In part 1 of this series on VOIP, Jim Gibson looks at a brief history of telephone PBX systems and how they differ from today's VOIP systems. If you appreciate our videos please consider supporting us: https://www.PayPal.me/cablesupply https://www.subscribestar.com/CableSupply
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购买 Internet-based Telephone Systems

广告
关于我们的广告
$79.99
Ooma Telo Voip Free Internet Home Phone Service. Affordable Landline Replacement. Unlimited Nationwide Calling. Call On The Go With Free Mobile App.
Amazon.com
Free shipping
$79.99
Ooma Telo Voip Free Internet Home Phone Service. Affordable Landline Replacement. Unlimited Nationwide Calling. Call On The Go With Free Mobile App.
Amazon.com
Free shipping
$140.77
$149.99
Ooma Telo Voip With 3 HD3 Handsets Complete Home Phone System For Unlimited Nationwide Calling, Mobile App Access, And Robocall Blocking Affordable
Amazon.com
524
Free shipping
$140.77
$149.99
Ooma Telo Voip With 3 HD3 Handsets Complete Home Phone System For Unlimited Nationwide Calling, Mobile App Access, And Robocall Blocking Affordable
Amazon.com
524
$110.55
$129.99
Ooma Telo Voip Free Internet Home Phone Service And HD3 Handset. Affordable Landline Replacement. Unlimited Nationwide Calling. Call On The Go With
Amazon.com
795
Free shipping
折扣 14%
$110.55
$129.99
Ooma Telo Voip Free Internet Home Phone Service And HD3 Handset. Affordable Landline Replacement. Unlimited Nationwide Calling. Call On The Go With
Amazon.com
795
$90.99
Ooma Telo Voip Reliable Home Phone Solution With Unlimited Nationwide Calls, Mobile App Accessibility, And Robocall Blocking
Amazon.com
Free shipping
$90.99
Ooma Telo Voip Reliable Home Phone Solution With Unlimited Nationwide Calls, Mobile App Accessibility, And Robocall Blocking
Amazon.com
Free shipping
$273.72
Cisco IP Phone 8851 - Voip Phone - SIP, RTCP, RTP, SRTP, SDP - 5 Lines - Charcoal - CP-8851-3PCC-K9=
Hummingbird Networks USA
$273.72
Cisco IP Phone 8851 - Voip Phone - SIP, RTCP, RTP, SRTP, SDP - 5 Lines - Charcoal - CP-8851-3PCC-K9=
Hummingbird Networks USA
$129.99
Ooma Telo Air And Handset. Free Internet Home Phone Service Wi-Fi Connectivity. Affordable Landline Replacement. Unlimited Nationwide Calling. Mobile
Amazon.com
Free shipping
$129.99
Ooma Telo Air And Handset. Free Internet Home Phone Service Wi-Fi Connectivity. Affordable Landline Replacement. Unlimited Nationwide Calling. Mobile
Amazon.com
Free shipping
$115.58
Cisco IP Phone 7821 - Voip Phone - SIP, SRTP - 2 Lines - CP-7821-3PCC-K9=
Hummingbird Networks USA
$115.58
Cisco IP Phone 7821 - Voip Phone - SIP, SRTP - 2 Lines - CP-7821-3PCC-K9=
Hummingbird Networks USA
$41.89
$146.53
Ooma Telo Voip Home Office Phone System. Free Internet Phone Service With Business Desk Phone. Affordable Landline Replacement. Unltd Nationwide Calling. Call On The Go With Free Mobile App.
amazeprice.com
折扣 71%
$41.89
$146.53
Ooma Telo Voip Home Office Phone System. Free Internet Phone Service With Business Desk Phone. Affordable Landline Replacement. Unltd Nationwide Calling. Call On The Go With Free Mobile App.
amazeprice.com
$140.54
Cisco Desk Phone 9841 - Voip Phone - With Trusted Platform Module (TPM) 2.0 With Caller ID/Call Waiting - SIP, SDP, RTCP, RTP, SRTP - 4 Lines - Carbon
Hummingbird Networks USA
$140.54
Cisco Desk Phone 9841 - Voip Phone - With Trusted Platform Module (TPM) 2.0 With Caller ID/Call Waiting - SIP, SDP, RTCP, RTP, SRTP - 4 Lines - Carbon
Hummingbird Networks USA
$163.83
Cisco IP Phone 7841 - With Multiplatform Phone Firmware - Voip Phone - SIP - 4 Lines - TAA Compliant - CP-7841-3PCC-K9=
Hummingbird Networks USA
8
$163.83
Cisco IP Phone 7841 - With Multiplatform Phone Firmware - Voip Phone - SIP - 4 Lines - TAA Compliant - CP-7841-3PCC-K9=
Hummingbird Networks USA
8
$982.73
Cisco 8744 IP Phone - Wi-Fi - Built-In Camera - Black - Voip - IEEE 802.11A/B/G/N - SLINK-8744-NA=
Hummingbird Networks USA
$982.73
Cisco 8744 IP Phone - Wi-Fi - Built-In Camera - Black - Voip - IEEE 802.11A/B/G/N - SLINK-8744-NA=
Hummingbird Networks USA
$149.00
Poly Edge E350 IP Desk Phones (Plantronics + Polycom) - Easy To Install With Included Wi-Fi - 8-Line Keys Supporting Up To 32 Lines - Integrated
Amazon.com
Free shipping
$149.00
Poly Edge E350 IP Desk Phones (Plantronics + Polycom) - Easy To Install With Included Wi-Fi - 8-Line Keys Supporting Up To 32 Lines - Integrated
Amazon.com
Free shipping
$36.83
$48.19
Ooma Telo Voip Free Internet Home Phone Service With 3 HD3 Handsets. Affordable Landline Replacement. Unlimited Nationwide Calling. Answering Machine. Option To Block Robocalls.
jmpropiedadca
Free shipping
折扣 23%
$36.83
$48.19
Ooma Telo Voip Free Internet Home Phone Service With 3 HD3 Handsets. Affordable Landline Replacement. Unlimited Nationwide Calling. Answering Machine. Option To Block Robocalls.
jmpropiedadca
Free shipping
$179.99
Grandstream Unified Communications IP PBX And Networking System With Wi-Fi - GCC6010W
IP Phone Warehouse
$179.99
Grandstream Unified Communications IP PBX And Networking System With Wi-Fi - GCC6010W
IP Phone Warehouse
$358.75
Yealink IP Phone W73P Bundle Of W70B Base And W73H Handset + 2-Unit W73H Handset
Amazon.com
Free shipping
$358.75
Yealink IP Phone W73P Bundle Of W70B Base And W73H Handset + 2-Unit W73H Handset
Amazon.com
Free shipping
$104.20
Cisco IP Phone 7811 - With Multiplatform Phone Firmware - Voip Phone - SIP, SRTP - Charcoal - CP-7811-3PW-NA-K9=
Hummingbird Networks USA
$104.20
Cisco IP Phone 7811 - With Multiplatform Phone Firmware - Voip Phone - SIP, SRTP - Charcoal - CP-7811-3PW-NA-K9=
Hummingbird Networks USA
$165.99
Ooma Telo Voip Residential Phone Service And HD3 Handset, Black (TELOHD3)
Staples
795
$165.99
Ooma Telo Voip Residential Phone Service And HD3 Handset, Black (TELOHD3)
Staples
795
$79.99
Ooma Telo Voip Phone System (Black, $50 International Calling Credit) OOMA TELO
B&H Photo-Video-Pro Audio
78
$79.99
Ooma Telo Voip Phone System (Black, $50 International Calling Credit) OOMA TELO
B&H Photo-Video-Pro Audio
78