VOIP – Voice Over IP
Voice over IP (VoIP) can be described as the ability to make telephone calls and send faxes over IP based data networks with a suitable Quality of Service (QoS). The voice information is sent in digital form using discrete packets rather than via dedicated connections as in the circuit-switched Public Switched Telephone Network (PSTN). There are two major international groups defining standards for VoIP:
• International Telecommunications Union, Telecommunications Standardization
Sector (ITU-T), which has defined the following:
– Recommendation H.323, covering Packet-based Multimedia Communications Systems (including VoIP)
• Internet Engineering Task Force (IETF), which has defined drafts of the
several RFC (Request for Comment) documents, including the following central
– RFC 3261, the Session Initiation Protocol (SIP)
The H.323 recommendation was developed in the mid 1990s and is a mature protocol.
SIP (Session Initiation Protocol) is an emerging protocol for setting up telephony, conferencing, multimedia, and other types of communication sessions on the Internet.
The Intel Dialogic HMP software provides supports both H.323 and SIP as well as FOIP – Fax Over IP.
In addition to answering inbound calls and making outbound calls these calls CALLMaster can transfer the calls to any other number either in a supervised or blind transfer fashion.CALLMaster can register with your VOIP Gateway/GateKeeper/Registrar to be fully integrated into your VOIP environment. It also works with VOIP service providers in a remote or locally hosted setup. Providing the most flexibility in any environment.
IP Network Configuration and Settings
CALLMaster supports both the H.323 and SIP VOIP protocols and various audio coders and DTMF formats. By default CALLMaster will run in stand alone mode and listen on port 5060 for incoming VOIP calls. Any VOIP device can call CALLMaster by dialing the IP address of the machine running the CALLMaster software. CALLMaster can also register with a Gateway or Registrar.
For CALLMaster to work in a VOIP environment the configuration file CMVOIP.cfg must be setup to match the VOIP environment. The CMVOIP.cfg file located in the CALLMaster\Data folder. This file allows the following setting to be made:
IP Protocol : The IP Protocol used for opening the IP ports, values: H323, SIP, or both
DTMFmode: Touch Tone signaling mode, possible options: OutOfBand, inband, or rfc2833
Audio format: Formats supported g711Alaw, g711Mulaw, gsm, gsmEFR, g723_5_3k, g723_6_3k, g729a, g729ab, t38UDPFax
If CALLMaster is to register with a Gateway, GateKeeper or Registrar then set the following values. If it is not registering then set the GWIP setting to 0.0.0.0.
Gateway or Registrar parameters:
GWAcctName - <username> GateWay account username for login to VOIP Gateway server
GWAcctPW - <password> GateWay account password for login to VOIP Gateway server
GWAcctRealm - <realm> of VOIP Gateway (optional)
GWIP - <IP address> Dot notation of VOIP Gateway server with optional port number eg 126.96.36.199:5060
LocalAlias - <IP address> Dot notation of CALLMaster
To learn more, see CALLMaster VoIP Configuration.