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URI Dialing (H.323, Annex O)


Content:


Conceptual fundamentals

H.323, Annex O (adopted in july 2003 in: H.323 version 5) describes the structure and the use of a Uniform Resource Locator (URL) combined with H.323 processes. The URL includes all the necessary parameters which are essential for its use in the H.323 setting.

The basic structure is the common form user@host. Both components (user and host) or only one (user alone or @host alone) are possible. The component user is a H.323-user or H.323-service name. The component host is a valid IP address or a full domain name and in order to obtain its resolution an already existing DNS infrastructure is used.

An URL is a proper subset of the Uniform Resource Identifier (URI). So every URL is always a URI (RFC 3986/1.1.3 and RFC 2396/1.2 ). Eine URL ist eine echte Teilmenge der . Somit ist jede URL immer auch eine URI ).

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MCU Conference Participation without Gatekeeper Registration

H.323, Annex O (URI Dialing) can be used for Dialing up to a MCU conference or for calling terminals via GDS from a terminal that is not registered with the gatekeeper. The syntax is realised differently by the manufacturers, see table 1.

Since 2016 the shorter form vc.dfn.de can be used in the dial syntax instead of mcu.vc.dfn.de for MCU calls.

LifeSize
194.95.240.2##KonferenzID
LifeSize Softphone
KonferenzID@mcu.vc.dfn.de or KonferenzID@vc.dfn.de
Polycom
mcu.vc.dfn.de##KonferenzID or vc.dfn.de##KonferenzID
Cisco (Tandberg)      
KonferenzID@mcu.vc.dfn.de or KonferenzID@vc.dfn.de
Sony
194.95.240.2#KonferenzID
Panasonic
194.95.240.35%KonferenzID
Tab.1 : Syntax of the manufacturer-specific URI Dialing in DFNVC-MCU

Example: The multipoint conference with the ID 004910097912345 can be contacted with a Polycom device via mcu.vc.dfn.de##004910097912345. To shorten the row of numbers, the MCU prefix 0049100 can be dropped.

In most cases, the terminal device must not be registered with a gatekeeper. In the system settings, a DNS (Domain Name Server) has to be determined. Device-specific differences in the dial-up procedure are represented in table 2.

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Device-Specific Dial-up Results of Different Terminals (Alphabetical)

System URI Dialing
Cisco C40 SW TC7.1, TC6.0
Cisco EX90 SW TC7.1, TC6.0
ConferenceID@194.95.240.2
(MCU call control) only without GK registration
Cisco C40 SW TC5.0
Cisco EX90 SW TC5.0

ConferenceID@mcu.vc.dfn.de
Only without GK registration

Cisco SX 20 ConferenceID@194.95.240.2
Only without GK registration
LifeSize Team 220
SW 4.8.3(5)
194.95.240.2##ConferenceID
(MCU call control)
LifeSize Softphone 8.1
Windows 7
ConferenceID@mcu.vc.dfn.de
Only without GK registration
LifeSize Softphone 8.1
Mac
ConferenceID@mcu.vc.dfn.de not working
Panasonic KX-VC 1600 SW 4.25 194.95.240.35%KonferenzID
With/without GK registration
Polycom RealPresence Desktop 3.3 vc.dfn.de##KonferenzID
Only without GK registration
Polycom Real Presence
Group 500 SW 4.0.2.
mcu.vc.dfn.de##ConferenceID
Only without GK registration
Polycom TelePresence m100
SW 1.05
mcu.vc.dfn.de##ConferenceID
Only without GK registration
Polycom HDX 8002 XL mcu.vc.dfn.de##ConferenceID
Only without GK registration
Polycom HDX 8004 XLP
SW 3.1.4
mcu.vc.dfn.de##ConferenceID
Only without GK registration
Polycom HDX 8004 XLP
SW 2.6
mcu.vc.dfn.de##ConferenceID
Only without GK registration
Polycom QDX 6000 mcu.vc.dfn.de##ConferenceID
With/without GK registration
Sony PCS-XC1 (V1.20) vc.dfn.de#ConferenceID
With/without GK registration
Sony PCS-XG80 (V 2.03)
Sony PCS-XG 100 (V 1.41)
194.95.240.2#ConferenceID
mcu.vc.dfn.de#Conference-ID
Tandberg 6000 MXP/
Tandberg 990 MXP F9.0.2
ConferenceID@194.95.240.2
Only without GK registration
Tab.2 : Results of the device-specific dial-up test in DFNVC-MCU via URI Dialing
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