Ask the Experts
Ask the Experts
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What is the difference between an analog and a digital PBX?
Expert Juan Pablo Pazos compares an analog PBX versus an IP PBX to a reader wondering whether or not PBXes were replaced more than twenty years ago by digital PBXes. Continue Reading
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How does a computer on the network get its IP address?
How does a computer on the network get its IP address? Continue Reading
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How does an ATA work?
How does an ATA work? Continue Reading
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What are the advantages and disadvantages of MPLS?
Learn the advantages and disadvantages of MPLS in this expert response from our telecommunications expert. Continue Reading
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ISDN, MPLS and VSAT
We have a centralized database online system with hub and spoke network architecture. On top of this, we have our own VPN setup. Our users either connect through VSAT or dedicated leased lines for accessing our system with ISDN as a last mile backup... Continue Reading
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How many calls can a T1 handle and what is bandwidth of each call?
Our site member is planning a VoIP implementation at his company. He asked, "How many simultaneous calls can be handled by a T1 and what is the bandwidth for each call?" Get the expert answer here. Continue Reading
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Can VoIP and firewalls work together for the greater security good?
To allow VoIP to pass through the firewall, ports have to be left open. Can you point out some ways to help VoIP and firewalls work together for the greater security good? Continue Reading
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Hardware and software required to set up basic VoIP service
Get details and resources to find the hardware and software you will need to set up VoIP at your company. This basic overview offers information on IP/PBXs, SIP equipment, IP phones, Softphones and E911. Continue Reading
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Codecs demystified
Learn more about the codec used by Skype and how it differs from other codecs in this expert answer. Patrick Ferriter explains Skype protocol, Global IP Sound, iLBC codec, GIPS, iSAC codec and SIP protocols here. Continue Reading
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Music on-hold (MoH) in the SIP world
Find out more about music on-hold (MoH) capabilities and SIP enabled audio streams in this expert answer. Continue Reading
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Nice Logger explained
Learn what Nice Logger is and what types of telephony cards it supports in this expert answer. Continue Reading
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What is tromboning?
In this expert reply, Patrick Ferriter explains what tromboning means in VoIP. Continue Reading
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Highest acceptable latency to attempt a VoIP call over
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Understanding customer acceptance
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DHCP lease renewal on IP phones
Learn how to handle DHCP lease renewal on IP phones in this expert response. Continue Reading
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Comparing IP with ATM networks
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Difference between data communications and IP based solution
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Toll-free call failure
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ADSL bandwidth
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How do satellite ATM networks work?
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Difference between gateway and router
Learn the difference between a gateway and a router in this Ask the Expert response. Continue Reading
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Risk factors for migration to IP telephony
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What exactly is SIP and what are its advantages and disadvantages?
Learn about the advantages and disadvantages of choosing SIP over H.323 or another VoIP traffic carrier. Continue Reading
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We want to use VoIP over the LAN without PBX hardware. Any suggestions?
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VoIP gateways and SS7
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What causes one-way conversation in a VoIP network?
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What is the difference between H.248 and H.323? And what are the differences between ATM and FR tech
Learn the difference between H.248 and H.323 and also what the differences are between ATM and frame relay (FR) technology. Continue Reading
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What is FXO and FXS?
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I'm confused about the term "IP Centrex." Can you explain?
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What is the difference between gateways and gatekeepers?
Learn what the difference is between a network gateway and a gatekeeper in this Ask the Expert response. Continue Reading
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What is the difference between Cisco call manager and Cisco SIP Proxy server?