Starplus Triad Xts Digital Key Telephone System System Programming And Operation Manual

							D
Voice Over the Internet
Protocol
This chapter contains detailed information about Voice Over the Internet Protocol. 
						

							











 
 
 
 
 
 
						

							Product DescriptionD-3
Appendix D - Voice Over the Internet Protocol
Product Description
The Discovery Voice Over the Internet Protocol (VoIP) printed circuit board (PCB) is for use on 
Vodavi XTS key service units (KSUs), that includes the Vodavi telephone systems. It provides 
an Ethernet interface to connect the KSU to an Internet Protocol (IP) network. The latest in 
voice processing protocols and hardware technologies are used to provide the highest 
quality voice over an IP network. In addition to supporting a Vodavi KSU, compatible IP 
phones can establish calls with the Discovery VoIP card, allowing calls to be made to and from 
the IP phone.
The Discovery VoIP card allows voice communication to other devices via an IP network such 
as an internal Local Area Network (LAN), the Internet, or a Wide Area Network (WAN) using 
the Ethernet interface. The Discovery VoIP card employs H.323 Revision 2 fast protocol to 
ensure Quality of Service (QoS). This protocol reduces echo, jitter, and latency whether the 
voice traffic is travelling via the Internet or a dedicated WAN. The result is a QoS that can be 
equal to or better than “Toll Quality”.*
Voice, call transfer, call conference, and DTMF capabilities for Interactive Voice Response (IVR) 
and Voice Mail (VM) systems are provided by the Discovery VoIP card through the IP network. 
By taking advantage of the existing telephony infrastructure, the Discovery VoIP card extends 
the reach of the KSU to remote and home offices. Bandwidth is allocated only when a call is 
established and can be managed through programmable voice encoder standards.
* Assumes high network availability and performance (
						

							D-4Specifications
Appendix D - Voice Over the Internet Protocol
Specifications
The Discovery VoIP card uses Transmission Control Protocol/Internet Protocol (TCP/IP) for 
packet delivery over an IP network. Additional standards and protocols are used to provide 
DTMF, voice processing, and compression.
The Discovery VoIP card can accommodate up to four Discovery VoIP modules. Each Discovery 
VoIP module provides capability for two ports, resulting in a maximum of eight ports when all 
four modules are installed.
Features
The following describes many of the features built into the Discovery VoIP card.
On-Board Processor
50 Mhz PowerPC RISC Processor
Protocols

TC P/IP

H.323 Revision 2
Multiple Voice Compression Technologies

G.723.1

G.729

G.711 A-Law

G.711 U-Law
Connections

One 10 / 100 Mps RJ45 Ethernet port

One RS-232 Port (for Administration and Troubleshooting)
VoIP Card Reset Button
The Discovery VoIP card can be reset separately from the rest of the KSU.
Network/Voice Troubleshooting Tools
The Admin port (RS-232) provides troubleshooting tools to determine network 
connectivity and to trace the current call status via HyperTerminal, ProComm, or other 
terminal emulation programs. Network connectivity is tested through the PING utility. 
Tracing call status will show H.323 and IP events during any call sent or received by the 
Discovery VoIP card. Also, the current VoIP configuration can be viewed through the 
Admin port. 
						

							InstallationD-5
Appendix D - Voice Over the Internet Protocol
Installation
Multiple connection types can be used to implement the Discovery VoIP card in the business 
environment. The speed of a network connection is measured in bandwidth or kilobytes per 
second (K or kbs). Business connections generally have a speed of 256K or greater. In 
comparison, a home user dialing into the Internet with a modem can reach a maximum 
speed of 56K.
The two main types of connections are managed and unmanaged. A managed connection is 
a private connection with a guaranteed amount of bandwidth. In this type of connection, the 
connection is completely managed by the business. This might be compared to a parking lot 
that is for employee use only. An unmanaged connection, however, is one that shares 
bandwidth with other users. The Internet is the best example of this type of connection. The 
Internet connects many different businesses, but no one is able to control the data travelling 
on the Internet. In this case, the performance of the connection depends on how many 
people are using the Internet. It is like a freeway, in that travel is slower when traffic is heavy 
and faster when traffic is light.
Hardware Requirements

At least two installed XTS systems with available card slots.

At least one Discovery VoIP card installed in each system
Network Requirements

A 10 / 100 MB LAN, Internet connection (256K or higher), or WAN (256K or higher) 
between each KSU or other device connection. WAN connections can be point-to-point, 
frame relay, or equivalent connections as long as the connection supports IP.

Available static IP addresses for each Discovery VoIP card. For example, an Internet 
routable address must be used if the Internet will be used to connect remote offices. 
Internal IP addresses are used on a private WAN.
System Requirements
A 4-digit dialing plan should be implemented before setting up the Discovery VoIP card.
See your network administrator before installation.
Refer to Ta b l e D- 1   for minimum and recommended bandwidths.
Network Address Translation (NAT) cannot be used to provide a routable address for the 
KSU. 
						

							D-6Installation
Appendix D - Voice Over the Internet Protocol
Te c h n i c a l  D a t a
Lower bandwidths, lower connection reliability, and high network latency will decrease 
Discovery VoIP performance. Bandwidths lower than 256K and network latency higher than 
120 ms may cause unacceptable performance. Intermittent fluctuating connections (i.e., 
some wireless broadband connections) will cause unacceptable performance problems. 
Have your network administrator check your network performance and bandwidth to 
determine your network constraints before installing the Discovery VoIP card.
Recommended Bandwidths
The following table shows the recommended and minimum bandwidths for use with 
Discovery VoIP. The values are based on the number of ports.
Ta b l e  D - 1 :  B a n d w i d t h s
Voice Encoder Information
There are four built-in voice encoding standards (vocoders) in the Discovery VoIP card. The 
most bandwidth-efficient standard is G.723.1 due to its compression technology. The highest 
voice quality is provided by the G.711 standard (both A-law and U-law) because no 
compression is used. The G.729 standard is between the G.723.1 and G.711 standards in 
terms of bandwidth usage and performance. The G.729 standard loses some voice quality 
due to the use of compression. The default vocoder standard is G.723.1 to conserve 
bandwidth.
The Discovery VoIP card intelligently handles incoming VoIP calls by negotiating with the 
initiating system to determine the preferred vocoder standard to use during that call. For 
example, a system that is set for the default standard (G.723.1) can initiate a call with another 
system set to the G.711 A-law standard. The entire call will be established with the G.723.1 
standard. The same is true for a G.711 A-law system establishing a call with the G.723.1 
system. In this case, the G.711 A-law standard will be used for that call. Lower bandwidth 
connections, however, may be saturated when using the G.711 standards.
2 Ports 4 Ports 6 Ports 8 Ports
Recommended512K 640K T1 T1
Minimum256K 256K 512K 512K
Note: Assumes network latency is below 120 ms 
						

							InstallationD-7
Appendix D - Voice Over the Internet Protocol
The following chart shows the bandwidth consumption by vocoder.
Figure D-1: Bandwidth Consumption by Vocoder
IP Phones
IP phones using the H.323 Revision 2 protocol will work with the Discovery VoIP card. The IP 
phone, however, will not be integrated into the system. Instead, the IP phone resembles a 
single-line telephone that uses the Internet or other IP network instead of the PSTN. IP 
phones allow dialing using the IP address of the destination system. Most IP phones allow the 
user to program a button with the IP address of the system to dial. This allows the user to dial 
in to the VoIP card where they are directed to the attendant. The attendant then transfers the 
user to the desired extension.
The vocoder standards may not be as flexible for the IP phone as the Discovery VoIP card. 
Ensure that the vocoder standards used on the KSU match the standards that are used on the 
IP phone. For example, a phone that uses only
 the G.711 U-law standards can initiate a call 
with any Discovery VoIP card. However, for a call to be initiated successfully by the KSU to the 
IP phone used in this example, the KSU default standard (G.723.1) must be changed to the 
G.711standard.
Not all IP phone manufacturers have adopted the H.323 Revision 2 standard. Therefore, 
Vodavi cannot guarantee the compatibility or performance of IP phones.
Bandwidth Usage (Kbs)
Bandwidth Usage per Port
Bandwidth Requirements 
						

							D-8Programming
Appendix D - Voice Over the Internet Protocol
Quick Start
This quick-reference diagram shows the configuration necessary to connect the Discovery 
VoIP card to the Internet, WAN network, or VPN network:
Figure D-2: Discovery VoIP Card Connection Diagram
Programming
The following Table shows the Network programming requirements.
 
Table D-2: VoIP Card Network Programming Requirements
Requirement Description
IP Address(es) An IP Address is required to properly program a 
Discovery Vo IP c ard  i n th e K SU .  I f 
the Internet will be the connection medium, an Internet routable address is 
necessary. The network administrator should be able to provide this address.
Subnet Mask A Subnet Mask is required to establish communications between endpoints. This 
address is critical to establish a connection between two or more switches. The 
Discovery VoIP card will not function without it.
Router An address must be supplied for the Gateway Router to provide connectivity. If 
no router exists between the KSUs (i.e., an internal LAN setup), then the other 
router’s IP address should be programmed here.
Domain Name The Domain Name is entered in Database Administration programming as 
follows: name.com (e.g., vodavi.com).
The “www” is not needed for programming. A dot or period (“.”) is added by 
dialing [24].
Vocoder This command is used to change the default audio capability. When establishing 
a call, the system making the call requests the preferred audio capability from 
the receiving system and negotiates the audio encoding to be used. This setting 
defines that preferred audio encoding.
KSU w/ VoIP Card
(Destination)
KSU w/ VoIP Card
(Source)
-or-
ROUTER-or-ROUTER CABLE/DSL MODEM
INTERNET (e.g., DSL or Cable),
WAN (e.g., T1 or Frame Relay), or
VPN
CABLE/DSL MODEM 
						

							ProgrammingD-9
Appendix D - Voice Over the Internet Protocol
Identifying the VoIP Card (FLASH 24)
The Discovery VoIP card can be placed in slots 1-7 of Cabinet 0 and in slots 0-8 of Cabinet 1 
and Cabinet 2. Once the slot is identified, it takes the required time slots and deducts them 
from the available ones. It activates all 8 circuits. If more then one card is identified, each card 
is identified in the same manner and it requires its own unique IP address.
1. While in the programming mode, dial [FLASH 24].
2. Press the button that corresponds with the Cabinet location of the VoIP card 
(Button #17-19 represents Cabinets 0, 1, and 2).
3. Press the button corresponding to the desired slot location. Buttons 1-9 indicate 
peripheral card slots 0-8. 
4. Dial the code (12) for the VoIP card and press HOLD.
Entering Network Programming Requirements (FLASH 46)
Flash Code 46 is for the specific network programming requirements for the Discovery VoIP 
card. IP address, subnet and router address information must be entered for the VoIP card to 
work. Each card installed in the system requires a separate IP address and subnet mask. The 
router address and domain name may be shared. See your network administrator for 
networking information.
1. Enter programming mode and dial [FLASH 46].
2. Enter the Cabinet number followed by the slot number where the Discovery VoIP card is 
installed twice (e.g., 0404 for a VoIP card installed in slot 4 of Cabinet 0) and press HOLD.
3. Press Button #1, enter the IP address for the card, then press HOLD to save the entry.
When entering an IP Address, the “

” key on the telephone acts the same as the  
key on a computer. An IP address can be entered using zeros where there is no number. 
For example: 10238

56
1 can be entered 102038056001, thus eliminating the need for 
using the “

” key. Either entry will display: 102. 038. 056. 001 (a zero is displayed as a 
“space” or “Null” character).
CAB   0  SLOT 04 00-14
VOIP
The first two digits indicate the FROM Cabinet/slot where the programming will come from. 
The second two digits indicate the TO Cabinet/slot (i.e., the programming destination). This 
method is used to provide for future functionality.
04-04 PAGE A
ENTER BUTTON NUMBER
IP ADDRESS
102.038.056.001 
						

							D-10Programming
Appendix D - Voice Over the Internet Protocol
4. Press Button #2, enter Subnet Mask, then press HOLD to save the entry.
A Subnet Mask of 255.255.255.0 is entered as 255255255 + [HOLD]; the telephone will 
display 255.255.255., which is correct.
5. Press Button #3, enter Router IP address, then press HOLD to save the entry.
6. Press Button #4, enter Domain Name (up to 64 characters), then press HOLD to save the 
entry.
The domain name is entered in standard Vodavi format:

The first number pressed identifies the three-digit group of alpha characters to be 
selected.

The second number (1,2, or 3) specifies the exact alpha character within the group.

The “.” symbol is represented by dialing [24].
Example -- Dialing 83633121834324236361 represents 
VODAVI.COM
7. Press Button #5, enter the desired vocoder value (0-4), then press HOLD to save the entry.
[0] = None
[1] = G.723.1 (default)
[2] = G.729
[3] = G.711 A-Law
[4] = G.711 U-Law
Each card requires its own IP address and its own Subnet Mask, using the standard format 
for each: xxx.xxx.xxx.xxx     Without these numbers, the VoIP card will not operate and will 
show as Out of Service (OOS) in the system.
SUBNET MASK
255.255.255.
ROUTER ADDRESS
102.038.056.100
DOMAIN NAME
VODAVI.COM
VOCODER 0-4
G.723.1