4

5

6

7

8

9

16

17

18

Send special information tone

Misdialled trunk prefix (national use)

Channel unacceptable

Call awarded, being delivered in an established channel

Preemption

Preemption circuit reserved for reuse

Normal call clearing

User busy

No user responding

not serve the destination desired. This cause is supported on a network dependent basis.

This cause indicates that the called party cannot be reached for reasons that are of a long term nature and that the special information tone should be returned to the calling party.

This cause indicates the erroneous inclusion of a trunk prefix in the called party number.

This cause indicates that the channel most recently identified is not acceptable to the sending entity for use in this call.

This cause indicates that the user has been awarded the incoming call, and that the incoming call is being connected to a channel already established to that user for similar calls (e.g. packet-mode x.25 virtual calls).

This cause indicates the call is being preempted.

This cause indicates that the call is being preempted and the circuit is reserved for reuse by the preempting exchange.

This cause indicates that the call is being cleared because one of the users involved in the call has requested that the call be cleared. Under normal situations, the source of this cause is not the network.

This cause is used to indicate that the called party is unable to accept another call because the user busy condition has been encountered. This cause value may be generated by the called user or by the network. In the case of user determined user busy it is noted that the user equipment is compatible with the call.

This cause is used when a called party does not respond to a call establishment message with either an alerting or connect indication within the prescribed period of time allocated.

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PictureTel 3.1 appendix

3.1 specifications

PictureTel 3.1 is a landmark software release that revolutionized the realm of video conferencing and remote communication technology in the late 1990s. Emerging from the need for effective and efficient communication in professional environments, PictureTel 3.1 combined innovative technologies and user-friendly features to facilitate high-quality video interactions.

One of the standout features of PictureTel 3.1 is its advanced video compression technology. By utilizing the H.261 standard, it enabled high-quality video transmissions over low-bandwidth connections, making it accessible for a wider audience. This capability paved the way for organizations to implement video conferencing without needing extensive infrastructure investments. The software's ability to dynamically adjust video quality based on available bandwidth ensured smooth sessions, minimizing interruptions and enhancing user experience.

Additionally, PictureTel 3.1 introduced a user-friendly interface that emphasized simplicity and ease of use. This intuitive design allowed users to initiate and manage video conferences effortlessly. The software supported a variety of input devices, including USB cameras, which expanded its compatibility across different hardware platforms. Users could easily connect to meetings with just a few clicks, which was revolutionary for companies looking to adopt remote communication solutions.

Another hallmark of PictureTel 3.1 was its robust multi-point capabilities. This meant that multiple participants could join a single conference, facilitating collaboration among teams dispersed across different locations. The software supported various layouts for video feeds, allowing users to customize their viewing experience according to their preferences and requirements.

Moreover, PictureTel 3.1 integrated seamlessly with existing telephone systems and other communication tools. This capacity for interoperability meant that organizations could combine traditional voice communication with modern video conferencing, creating a holistic communication experience. Features like screen sharing and document collaboration further enriched meetings, providing teams with the tools necessary for effective communication and teamwork.

In conclusion, PictureTel 3.1 exemplified the potential of video conferencing technologies during its time. Its innovative features, including advanced video compression, user-friendly interface, robust multi-point capabilities, and seamless integration with existing systems, set the foundation for future advancements in remote communication. As organizations increasingly embraced remote work and global collaboration, PictureTel 3.1 played a critical role in transforming how businesses communicate, paving the way for modern video conferencing solutions today.