Voip Signalling Protocols - Avaya DECT R4 Installation And Administration Manual

VoIP signalling protocols

The protocol used for VoIP signalling is H.323 XMobile which is a proprietary extension of
H.323. H.323 was the first standard and is in fact a set of protocols designed to enable
multimedia traffic in single LANs. One protocol of many in the set of protocols defined in H.323,
is H.450, which is a series of protocols which defines Supplementary Services for H.323.
H.323
The International Telecommunications Union (ITU) developed H.323 from a
telecommunications perspective. Ratified in 1996, H.323 has become a common choice for
interoperability among VoIP equipment. H.323 is a standard that provides specifications for
computers, equipment, and services for multimedia communication over networks that do not
provide guaranteed QoS.
H.323 equipment can carry real-time video, audio, and data, or any combination of these
elements. The H.323 standard includes H.225, H.245, and the IETF protocols RTP and RTCP,
with additional protocols for call signalling and data and audiovisual communications.
Benefits of using H.323 products and services:
Products and services developed by multiple manufacturers under the H.323 standard can
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interoperate without platform limitations. H.323 conferencing clients, bridges, servers, and
gateways support this interoperability.
H.323 provides multiple audio and video codecs that format data according to the
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requirements of various networks, using different bit rates, delays, and quality options.
Users can choose the codecs that best support their computer and network selections.
H.323 XMobile
The protocol between the IP-PBX and the Master IPBS is based on H.323 with some minor
differences called XMobile, such as:
No need to register the DECT Wireless Terminal with the Gatekeeper. No RAS procedure
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necessary.
Shared trunk between the IP-PBX and the Master IPBS where all telephony signalling is
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going
QSIG
QSIG is a standardised signalling protocol, that is mainly used for signaling between
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traditional PBXs. This allows interoperability between communications platforms provided
by different vendors.
Avaya DECT R4 - System Description
VoIP signalling protocols
02/2016
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