Instruction Manual
Table Of Contents
- Preface
- Introducing Linksys IP Phones
- Getting Started
- Managing Linksys IP Phones
- Using the 900 Series LCD Display
- Localization
- Changing the Display Background (SPA942/962)
- Using the SPA932 (Sidecar) with the SPA962
- Configuring the Web Service
- RSS Newsfeeds (SPA962)
- Call Appearances and Extensions
- Line Key LEDs
- Using Call Features
- Selecting the Audio I/O Device and Line
- Making Calls
- Answering and Ending Calls
- Hold and Resume
- Call Waiting
- Speed Dialing
- Three-Way Conferencing
- Attended Call Transfer
- Blind Call Transfer
- Call Back
- Message Waiting Indication (MWI)
- Accessing Voicemail
- Muting Calls
- Shared Call Appearances
- Personal Directory
- Caller and Called Name Matching
- Dialing Assistance
- Supplementary Services
- Call Logs
- Audio Volume Adjustment
- Managing Ring Tones
- Configuring a Dial Plan
- System Administration
- Troubleshooting FAQ
- SPA900 Series LCD Command Reference
- Entering Names and Numbers into the Directory
- Entering Directory Names, Numbers and Ring Default
- 2 Speed Dial
- 3 Call History
- 4 Ring Tone
- 5 Preferences
- 6 Call Forward
- 7 Time/Date
- 8 Voice Mail
- 9 Network
- 9.1 DCHP
- 9.2 Current IP Address
- 9.3 Host Name
- 9.4 Domain
- 9.5 Current NetMask
- 9.6 Current Gateway
- 9.7 Enable Web Server
- 9.8 Non DHCP IP Address
- 9.9 Non DHCP Subnet Mask
- 9.10 Non DHCP Default Route
- 9.11 Non DHCP DNS 1
- 9.12 Non DHCP DNS 2
- 9.13 Non DHCP NTP Server 1
- 9.14 Non DHCP NTP Server 2
- 9.15 Multicast Address
- 9.16 Enable VLAN
- 9.17 VLAN ID
- 9.18 CDP
- 10 Product Info
- 11 Status
- 12 Reboot
- 13 Restart
- 14 Factory Reset
- 15 Custom Reset
- 16 Set Password
- 17 Set LCD Contrast
- 18 CallPark Status
- 19 Language (SPA922, 942, and 962)
- 20 GUI Properties (SPA962)
- 21 Web Service (SPA962)
- Linksys IP Phone Field Reference
- Acronyms
- Glossary
1-9
Linksys IP Phone Administrator Guide
Firmware Version 5.1
Chapter 1 Introducing Linksys IP Phones
Technology Background
• Using Linksys IP Phones with a Firewall or Router, page 1-9
• Using Linksys IP Phones with a Firewall or Router, page 1-9
Session Initiation Protocol
Linksys 900 Series IP phones are implemented using open standards, such as Session Initiation Protocol
(SIP), allowing interoperation with all ITSPs supporting SIP.
Figure 1-2 illustrates a SIP request for
connection to another subscriber in the network. The requestor is called the user agent server (UAS),
while the recipient is called the user agent client (UAC).
Figure 1-2 SIP Requests and Responses
In a SIP VoIP network, when the SIP proxy receives a request from a UAS for a connection and it does
not know the location of the UAC, it forwards the message to another SIP proxy in the network. Once
the UAC is located and the response is routed back to the UAS, a direct peer-to-peer session is
established between the two UAs. The actual voice traffic is transmitted between UAs over dynamically
assigned ports using the Real-time Protocol (RTP).
Using Linksys IP Phones with a Firewall or Router
When using a Linksys IP phone behind a firewall or router, make sure that the following ports are not
blocked:
• SIP ports—By default, UDP port 5060 and 5061
• RTP ports—16384 to 16482
If security is not a concern in your environment, you can consider disabling SPI, if this function exists
on your firewall.
SIP UA
SIP UA
SIP Proxy
SIP Proxy
RTP
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2
3
4
SIP Proxy