13.6.1  
Protocols 
 
This section contains an overview of H.323 standards regarding signaling and media protocol that are relevant to HG 1500.

H.225.0 Q.931 Call Setup  
This protocol defines signaling between two endpoints for call setup and cleardown.

H.225.0 RAS Control  
RAS (Registration, Admission and Status) defines signaling between client and gatekeeper for detection and registration purposes.

H.245 Signaling  
This protocol defines the declaration of capabilities and exchange of control messages between endpoints. It is used for specifying channel usage and functions.

H.323  
This is a standard for packet-oriented multimedia communication systems and was developed by the ITU (International Telecommunication Union. HG 1500 uses H.323 V4.0 but can also communicate with earlier versions of the H.323 protocol (backward compatibility is guaranteed).
Fast Connect (fast start) is supported. The Fast Connect feature lets HG 1500 set up a multimedia channel without waiting for an H.245 connection.

RTP and RTCP  
RTP (Real-time Transport Protocol) manages the transfer of real-time packets from an endpoint to one or more endpoints.
A header containing a time stamp and a sequence number is added to every UDP packet. With appropriate buffering at the receiving station, timing and sequence information enables the application to:
 •   eliminate double packets,
 •   rearrange nonsequential packets,
 •   synchronize data,
 •   achieve continuous playback despite varying latencies.
RTCP (Real-time Control Protocol) is used for controlling RTP. It enables:
 •   Quality of Service (QoS) monitoring,
 •   transferring of information about session participants,
 •   regular distribution of control packets containing quality information to all session participants.

TCP  
TCP (Transmission Control Protocol) provides a connection-oriented mode for data transmission. TCP guarantees a sequenced, error-free, flow-controlled transmission of data packets. However, this can delay data transfer and reduce throughput. H.323 uses the end-to-end services of TCP for the H.245 control channel, data channels and the call control channel.

UDP  
The UDP (User Datagram Protocol) provides a connectionless transmission mode that promises nothing more than a "best effort" delivery. Only a minimum of control information is transferred with UDP. H.323 uses UDP for audio, video and the RAS channel (see RFC 768).

13.6.1.1  
Protocols Used 

 Table 13-2   Protocols Used
PPP  
Point-to-Point Protocol  
Transport protocol between LAN and SCN  
PAP  
Password Authentication Protocol  
Transport protocol for ID and password  
CHAP
(MSCHAP)  
Challenge Handshake
Authentication Protocol  
Transport protocol for encrypted ID and password (MS = Microsoft-specific protocol)  
IPCP  
IP Control Protocol  
Transport protocol for IP addresses  
PPPoE  
PPP over Ethernet Protocol  
Transport protocol between LAN and SCN over Ethernet  
PPTP  
Point-to-Point Tunneling Protocol  
Transport protocol for tunneled PPP connections  
IP  
Internet Protocol  
Transport protocol for data transfer to IP or MAC addresses without a connection  
ICMP  
Internet Control Message
Protocol  
Control protocol that supports IP protocol with error messages  
UDP  
User Datagram Protocol  
Transport protocol for data transfer without a connection  
TCP  
Transmission Control Protocol  
Transport protocol for connection-oriented data transfer  
DHCP  
Dynamic Host Configuration
Protocol  
Protocol for dynamic configuration of host systems  
ARP  
Address Resolution Protocol  
Protocol for linking IP addresses with MAC addresses  
FTP  
File Transfer Protocol  
Protocol for file transport between network nodes  
TFTP  
Trivial File Transfer Protocol  
Simple file transport protocol  
RTP  
Real-time Transport Protocol  
Transport protocol for real-time audio and video packets  
RTCP  
Real-time Control Protocol  
Control protocol for RTP  
HIP  
HDLC Internet Protocol  
Control protocol for transferring encapsulated data in the Internet  
Telnet  
Protocol  
Dial-in protocol for remote access via the Internet  
H.225.0  
Annex G  
Signaling protocol for edge gatekeepers in different domains  
Q.931  
Signaling protocol for call setup and cleardown between two endpoints  
RAS Control  
Defines signaling between client and gatekeeper for detection and registration  
H.235  
Standard  
Signaling protocol for authentication and encryption  
H.245  
Standard  
Signaling protocol for defining usage of functions and channels  
H.323  
Standard  
Transport protocol for packet-oriented multimedia communication systems  
H.341  
Standard  
Definition of Management Information Base for controlling and administering an H.323 network  
H.450  
Standard  
A series of protocols that define signaling between endpoints for supplementary services  
HTTP
HTTPS  
Hypertext Transfer Protocol (Secure)  
Transport protocol for transferring text and graphics in the Web (secure connection)  
SNMP  
Simple Network Management Protocol  
Connection protocol for network management systems  

HiPath 3000/5000 V9, Service Documentation, Issue 7   up Top
Disclaimer & Copyright   ID: P31003H3590S100017620   2012-06-25