• What is SIP?

    Get a quick definition of SIP and resources for additional SIP information here.

  • QoS for a VPN VoIP call

    Find out if it is possible to provide QoS for a VPN VoIP call in this expert answer. Also learn more about encapsulation inside the VPN tunnel and IP ToS values here.

  • 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...

  • Softphone developed to use H.323. Moving to SIP. Now what?

    A SearchEnterpriseVoice.com member wonders how to create a new endpoint on a softphone he developed through NetMeeting SDK to use H.323. Get advice on obtaining SIP specs and SDKs here.

  • 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 SI...

  • VoiceXML IVRs and VUI design

    Learn more about VoiceXML IVRs and Voice User Interface (VUI) design here.

  • Business-grade VoIP

    Many hosted VoIP solutions are not business-grade. Find out what to look for in an enterprise level VoIP provider here.

  • VoVPN for 5 worldwide locations

    This expert answer offers advice on setting up Voice over VPN for international business.

  • QoS issues on Sipura when surfing the Net

    A SearchEnterpriseVoice.com member is using a Sipura 3000 in an ADSL line with 128 Kbps upstream and 512 Kbps downstream. They have three computers on the line. Surfing the Net causes calls in SPA ...

  • Cross talk on Alcatel a4400 ePBX

    A SearchEnterpriseVoice.com member has connected two Alcatel a4400 ePBXs through a lease line and is experiencing a problem with cross talk. Expert Patrick Ferriter suggests possible fixes here.

  • Poor voice quality on international conference calls

    The expert answer offers advice on international conference calling services.

  • 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.

  • Music on-hold and SIP enabled softswitches

    Learn how music on-hold (MoH) works in a SIP environment in this expert answer.

  • Nice Logger explained

    Learn what Nice Logger is and what types of telephony cards it supports in this expert answer.

  • Solving echo and lag for call recipient

    In this expert response, Patrick Ferriter explains why a call recipient might experience echo. He explains the two main sources of echo in telephony networks and and how to fix the issue.

  • Redundancy in an IP telephony network utilizing inline power

    Where is it most important to have redundancy in an IP telephony network utilizing inline power? Get expert advice on the levels of redundancy, PoE switches and Spanning Tree Protocol (STP) here.

  • Outsourcing VoIP

    Learn how outsourcing VoIP might save money in this expert answer by Tom Pisello. Tom also explains key outsourcing considerations.

  • Low-cost enterprise VoIP services

    Learn more about low-cost enterprise VoIP services in this expert response. Learn when a hosted solution makes more sense than an in-house solution.

  • Can a VoIP user opt-out of E911?

    Get a detailed explanation of E911 requirements for business and proposed E911 solutions for the Wi-Fi VoIP phones here. Expert Patrick Ferriter also explains if a VoIP user can opt-out of E911.

  • Voice over VPN explained

    Get Patrick Ferriter's expert explanation of Voice over VPN in this reply.