Parameter, set it to Enabled, T38MaxVal

Chapter 3 Provisioning the Cisco HSI

Cisco HSI Configuration

Table 3-3 Static System Data Parameters (continued)

Parameter	Type	Description

PavoRedirPresInd	[0-3]	The value of the Pavo redirecting number presentation indicator. (If this
		parameter is not provisioned, the default is Q.931 zero—no indication.)

CliInDisplaySupported	STRING	If this parameter is present and set to anything other than “”, the Calling Number
		is also sent in the DISPLAY IE. The NetMeeting endpoint retrieves the calling
		party number from the DISPLAY IE in the H.225 setup message. To enable this
		parameter, set it to “Enabled.”

T38MaxVal	STRING	The T38MaxVal parameter has the following optional attributes that can be
		assigned values in a specific range.
		Note Values for the following attributes must be expressed in hexadecimal
		format.
		• MaxBit—[0x0—0xFFFFFFFF]. Specifies the maximum bit rate in units
		of 100 bits per second at which a transmitter can transmit or a receiver
		can receive T.38 FAX data. The default value is 0x90.
		• FxMaxBuf—[0x0—0xFFFFFFFF]. Specifies the maximum buffer size
		for the "t38FaxMaxBuffer" parameter for the T.38 over UDP option. The
		default value is 0xc8.
		• FxMaxData—[0x0—0xFFFFFFFF]. Specifies the maximum datagram
		size for the "t38FaxMaxDatagram" parameter for the T.38 over UDP
		option. The default value is 0x48.

T38Options	STRING	This T.38 Fax parameter is assigned one of the following optional values:
		• FxFillBit—[0 or 1] The default value is 0.
		• FxTransMMR—[0 or 1] The default value is 0.
		• FxRateTransJBIG—[0 or 1] The default value is 0.
		• FXRate—[Local or Trans] The default value is Trans.
		• FxUdpEC—[Red or FEC] The default value is Red.

AsymmetricHandlingSupported	STRING	Asymmetric Codec Treatment support is enabled if this parameter is present and
		set to anything other than “”. To enable Asymmetric Codec Treatment, set this
		parameter to “Enabled.”

UseConfID	STRING	Use this parameter to specify the precedence of extracting the Global Call ID
		from the Conference ID or the GUID in the H.225 Setup message. The
		provisioning of this property to a value other than “” gives precedence to the
		Conference ID. For example, set it to “Enabled.” To set the precedence to the
		GUID field, the crafts person can either delete the property from the config or
		set it to “”.

	Cisco H.323 Signaling Interface User Guide
3-6	OL-4806-01 Rev. A14

H.323 specifications

Cisco Systems H.323 is a set of standards designed for transmitting audio, video, and data over packet-switched networks. It is a critical technology that enables real-time communication and has become integral to the world of VoIP (Voice over Internet Protocol) and video conferencing applications. Originally developed by the ITU-T, H.323 has been widely adopted and implemented by Cisco Systems, allowing organizations to leverage reliable and scalable communication solutions.

One of the standout features of H.323 is its ability to support interoperability among varying equipment and platforms. This means that devices from different manufacturers can communicate seamlessly, which is vital in a diverse technical environment. H.323 does this by defining protocols that handle signaling, media transport, and control, ensuring that various systems can work together effectively.

Key technologies utilized within H.323 include H.225 and H.245 signaling protocols. H.225 is responsible for call setup and management, establishing communication between endpoints. In contrast, H.245 manages the negotiation of media channels, allowing devices to configure themselves based on the capabilities of each other. This adaptability is crucial for dynamic network conditions typical in VoIP applications.

Another defining characteristic of H.323 is its support for multiple types of multimedia communication, including point-to-point and multipoint calls. This flexibility supports everything from simple audio calls to complex videoconferencing setups, where many participants can share video and audio streams concurrently. Cisco enhances this capability through its hardware and software offerings, optimizing performance for conference calls.

H.323 also features robust error resilience mechanisms. This ensures that real-time data, which is typically sensitive to delays and losses, can be transmitted with minimal disruption. Moreover, it facilitates quality of service (QoS) implementation, allowing organizations to prioritize voice and video traffic over less critical data services, thereby improving the overall user experience.

In conclusion, Cisco Systems H.323 stands out as a comprehensive solution for real-time communication over packet-based networks. Its main features, including interoperability, multimedia support, and enhanced error resilience, position it as a relevant technology in both corporate and personal communication settings. As organizations continue to adopt cloud and hybrid communication models, H.323 remains a reliable backbone for ensuring connectivity and collaboration across diverse platforms.

Cisco Systems H.323 Parameter, set it to Enabled, T38MaxVal, Assigned values in a specific range

Models: H.323

Parameter

Description

parameter, set it to “Enabled.”

T38MaxVal

assigned values in a specific range.

format.

can receive T.38 FAX data. The default value is 0x90.

• FxMaxBuf—[0x0—0xFFFFFFFF]. Specifies the maximum buffer size

default value is 0xc8.

• FxMaxData—[0x0—0xFFFFFFFF]. Specifies the maximum datagram

option. The default value is 0x48.

T38Options

• FxFillBit—[0 or 1] The default value is 0.

• FxTransMMR—[0 or 1] The default value is 0.

• FxRateTransJBIG—[0 or 1] The default value is 0.

• FXRate—[Local or Trans] The default value is Trans.

• FxUdpEC—[Red or FEC] The default value is Red.

AsymmetricHandlingSupported

parameter to “Enabled.”

UseConfID

set it to “”.

OL-4806-01 Rev. A14

H.323 specifications