Switching to VoIP

Index

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T carrier

t extension, Asterisk

T extension, Asterisk

T.120 protocol

T.30 protocol

T.37 protocol 2nd

T.38 protocol

T1 circuit 2nd 3rd

        bandwidth of

        channelized or split-use

        compared to VoIP

        connecting PBXs by

        wireless T1

T1 interfaces, Asterisk and

T1/PRI trunks 2nd

T100P interface card

T3 circuit 2nd

TAFM (The Asterisk Fax Manager)

talk extension, Asterisk

TCP (Transmission Control Protocol)

TCP/IP network

        reliability of

        VoIP requiring

TCP/IP, as transport for VoIP trunks

TDD MODE command, AGI

TDM (time division multiplexing) 2nd

TDM equipment vendors

TDM phones

TDM400P interface card 2nd

TE400 Series interface card

Telecommunications Standardization Sector (ITU-T)

Telecommunications Systems Inc.

Telecontrol Corp.

telephone services, list of

TELEPHONECOMP variable, Asterisk

telephony 2nd

telephony hardware vendors

telephony software 2nd

television cable trunks

Telos ISDN H.323 Gateway

terminals

        endpoints as

        H.323 protocol

terms used in this book

text-to-speech

TFTP (Trivial File Transfer Protocol) 2nd 3rd

TFTP server 2nd

The Asterisk Fax Manager (TAFM)

three-way calling

Tiff2PS utility

time division multiplexing (TDM) 2nd

time required to implement VoIP

time-based context includes

timing of VoIP rollout

TiVo Series 2 devices

tones

        DTMF tones

        standard tones

topology

ToS (Type of Service)

TOSC Call Soft Pro

traceroute, auditing performance with

traditional phones, integrating into VoIP network

traffic class expediting

traffic diversion

training required for VoIP implementation

transcoding 2nd

Transfer command, Asterisk

Transmission Control Protocol (TCP)

transport

transport layer, OSI model

Trivial File Transfer Protocol (TFTP) 2nd

Trojan horses

troubleshooting

        ATA ports connected incorrectly

        audio dropouts across wide area call path

        budget too small

        callers can't hear you

        capabilities negotiation

        Cisco IP phones not accepting 802.3af inline power

        dialed digits not working with IVR prompts

        echo

        first part of sentences cut off

        inability to receive calls from PSTN

        interoperability problems 2nd

        interrupting between callers

        IP phone unable to make calls

        jitter

        latency

        loss of dial-tone periodically

        media loads, simulating

        packet inspection for

        PBX to IAXTel sound quality is poor

        performance loss with high call utilization

        power loss causing loss of phone use

        QoS issues

        robotic sound quality

        signaling problems

        SIP registrations not working through firewall

        softPBX going down

        software bugs , status and reporting

        switchover date missed by phone company

        tools for 2nd

        user complaints

trunk channel, creating with POTS line

trunk groups 2nd

trunk ports

trunks 2nd 3rd 4th 5th

        ATM trunks

        bulk trunk providers

        Centrex trunks

        dial-tone trunks 2nd 3rd 4th

        fiber trunks

        hunt groups of

        ISDN BRI trunks

        legacy trunks

        POTS trunks

        private trunks 2nd

        switch-to-switch trunk

        television cable trunks

        VLAN trunks

TSP (telephony service provider) 2nd 3rd

        dial prefixes for calling between

        emergency dispatch service requirements

        QoS for

        regulation of

        VPN not used by

txfax command, SpanDSP

typographical conventions used in this book