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Feature Descriptions, SIP Proxy Redundancy, Supported Codecs - provisioning

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Feature Descriptions Chapter 1 Introducing Linksys 900 Series IP Phones Feature Descriptions SPA900 Series IP phones are full featured, fully programmable IP phones that can be custom provisioned within a wide range of configuration parameters. This chapter contains a high-level overview of features to provide a basic understanding of the feature breadth and capabilities of SPA900 Series IP phones. • SIP Proxy Redundancy, page 1-8 • Supported Codecs, page 1-8 • Other Features, page 1-9 SIP Proxy Redundancy In typical commercial IP Telephony deployments, all calls are established through a SIP proxy server. An average SIP proxy server may handle tens of thousands of subscribers. It is important that a backup server be available so that an active server can be temporarily switched out for maintenance. SPA900 Series IP phones support the use of backup SIP proxy servers so that service disruption should be nearly eliminated. A simple way to support proxy redundancy is to configure a static list of SIP proxy servers in the SPA900 Series IP phone configuration profile, where the list is arranged in order of priority. The SPA900 Series IP phone attempts to contact the highest priority proxy server whenever possible. The dynamic nature of SIP message routing makes the use of a static list of proxy servers inadequate in some scenarios. In deployments where user agents are served by different domains, for instance, it would not be feasible to configure one static list of proxy servers per covered domain into every SPA900 Series IP phone. One solution to this situation is through the use of DNS SRV records. SPA900 Series IP phones can be instructed to contact a SIP proxy server in a domain named in SIP messages. The SPA900 Series IP phone consults the DNS server to get a list of hosts in the given domain that provides SIP services. If an entry exists, the DNS server returns an SRV record that contains a list of SIP proxy servers for the domain, with their host names, priority, listening ports, and so on. The SPA900 Series IP phone tries to contact the list of hosts in the order of their stated priority. If the SPA900 Series IP phone is currently using a lower priority proxy server, it periodically probes the higher priority proxy to see whether it is back on line, and attempts to switch back to the higher priority proxy whenever possible. Supported Codecs Negotiation of the optimal voice codec sometimes depends on the ability of SPA900 Series IP phone to "match" a codec name with the far-end device/gateway codec name. SPA900 Series IP phones allow the network administrator to individually name the various codecs that are supported such that the correct codec successfully negotiates with the far-end equipment. Linksys 900 Series IP Phone Administrator Guide 1-6 Document Version 3.0

Section	Page
Linksys 900 Series IP Phone Administrator Guide	1
Contents	3
Preface	11
Document Audience	11
Linksys 900 Series IP Telephones	11
How This Document is Organized	12
Document Conventions	12
Related Documentation	13
Technical Support	13
1	15
Introducing Linksys 900 Series IP Phones	15
Overview	15
SPA900 Series Features	16
SPA901 Features	17
SPA92x, SPA94x, and SPA962 Features	18
Ensuring Voice Quality	18
Feature Descriptions	20
SIP Proxy Redundancy	20
Supported Codecs	20
Other Features	22
Technology Background	24
Session Initiation Protocol	24
Using 900 Series Phones with a Firewall or Router	24
Network Address Translation	25
NAT Overview	25
NAT Types	26
Simple Traversal of UDP Through NAT	26
SIP-NAT Interoperation	27
Where to Go From Here	28
2	29
Getting Started	29
Linksys 900 Series IP Phones	29
Caring for Your Hardware	30
SPA901	30
Front Panel and Side of Phone	31
Back Panel	31
SPA92x, SPA94x, and SPA962 Hardware Features	31
SPA921	32
Front Panel	32
Back Panel	33
SPA922	33
SPA941	33
Front Panel	34
Back Panel	34
SPA942	35
SPA962	35
Front Panel	36
Back Panel	36
Establishing Connectivity	37
Bandwidth Requirements	37
Installing the SPA900 Series IP Phone	38
Assembling the Phone and Connecting to the Network	38
Attaching the Desk Stand	38
Mounting the Phone to the Wall	39
Turning on the Phone	39
Using the Administration Web Server	39
Connecting to the Administration Web Server	40
Administrator Account Privileges	40
Web Interface URLs	41
Upgrade URL	41
Resync URL	42
Reboot URL	42
Provisioning	42
Provisioning Capabilities	43
Configuration Profile	43
Using the Interactive Voice Response Interface	44
Using the IVR Menu	44
IVR Options	45
Entering a Password through the IVR	47
3	49
Managing Linksys 900 Series IP Phones	49
Using the LCD Display	49
LCD Display Controls	50
Using Soft Keys	51
Entering and Saving Settings	53
Localization	54
Changing the Display Background (SPA962)	56
Call Appearances and Extensions	57
Line Key LEDs	58
Using Call Features	59
Selecting the Audio I/O Device and Line	60
Making Calls	60
Answering and Ending Calls	61
Hold and Resume	61
Call Waiting	61
Speed Dialing	62
Three-Way Conferencing	62
Attended Call Transfer	63
Blind Call Transfer	63
Call Back	64
Message Waiting Indication (MWI)	64
Accessing Voicemail	64
Muting Calls	64
Shared Call Appearances	65
Personal Directory	65
Caller and Called Name Matching	65
Dialing Assistance	66
Supplementary Services	66
Call Logs	66
Audio Volume Adjustment	68
Managing Ring Tones	68
Configuring a Dial Plan	70
Dial Plan Digit Sequences	70
Dial Plan Rules	71
Digit Sequence Syntax	71
Element Repetition	71
Sub-sequence Substitution	72
Intersequence Tones	72
Number Barring	72
Interdigit Timer Master Override	72
Local Timer Overrides	72
Pause	72
Implicit Sequences	73
Dial Plan Examples	73
Dial Plan Timers	74
Interdigit Long Timer	74
Interdigit Short Timer	74
Dial Plans	74
System Administration	75
Reboot and Restart	75
Factory Reset	75
Password Protection	75
Managing the Time/Date	75
Daylight Saving Time	76
Using Star Codes to Activate/Deactivate Services	77
Disabling Services	78
Error and Log Reporting	79
Troubleshooting FAQ	80
4	83
LCD Command Reference Guide	83
1 Directory	84
Entering Names and Numbers into the Directory	84
Entering Directory Names, Numbers and Ring Default	84
2 Speed Dial	85
3 Call History	85
Redial List	85
Answered Calls	86
Missed Calls	86
4 Ring Tone	86
5 Preferences	86
5.1 Block Caller ID	87
5.2 Block Anonymous Call	87
5.3 Do Not Disturb	87
5.4 Secure Call	87
5.5 Dial Assistance	88
5.6 Preferred Audio Device	88
6 Call Forward	88
6.1 CFWD All Number	88
6.2 CFWD Busy Number	88
6.3 CFWD No Ans Number	89
6.4 CFWD No Ans Delay	89
7 Time/Date	89
8 Voice Mail	89
9 Network	90
9.1 DCHP	90
9.2 Current IP Address	90
9.3 Host Name	91
9.4 Domain	91
9.5 Current NetMask	91
9.6 Current Gateway	91
9.7 Enable Web Server	91
9.8 Non DHCP IP Address	92
9.9 Non DHCP Subnet Mask	92
9.10 Non DHCP Default Route	92
9.11 Non DHCP DNS 1	92
9.12 Non DHCP DNS 2	92
9.13 Non DHCP NTP Server 1	92
9.14 Non DHCP NTP Server 2	93
10 Product Info	93
10.1 Product Name	93
10.2 Serial Number	93
10.3 Software Version	93
10.4 Hardware Version	94
10.5 MAC Address	94
10.6 Client Cert	94
11 Status	94
Phone	94
Ext 1/2/3/4	95
Line 1, 2,3,4	95
12 Reboot	95
13 Restart	95
14 Factory Reset	95
15 Set Password	96
16 Set LCD Contrast	96
17 CallPark Status	96
18 Language (SPA922, 942, and 962)	96
5	99
SPA900 Series Phone Field Reference	99
Info Tab	99
System Information	100
Product Information	100
Phone Status	101
Ext 1/2/3/4/5/6 Status	101
Line 1/2/3/4/5/6 Status	102
Downloaded Ring Tone	103
System Tab	104
System Configuration	104
Internet Connection Type	104
Static IP Settings	105
PPPoE Settings	105
Optional Network Configuration	105
VLAN Settings	106
SIP Tab	107
SIP Parameters	107
SIP Timer Values (sec)	109
Response Status Code Handling	110
RTP Parameters	111
SDP Payload Types	113
NAT Support Parameters	115
Linksys Key System Parameters	116
Regional Tab	117
Call Progress Tones	117
Distinctive Ring Patterns	119
Control Timer Values (sec)	120
Vertical Service Activation Codes	120
Outbound Call Codec Selection Codes	125
Miscellaneous	127
Phone Tab	131
General	131
Line Key 1/2/3/4/5/6	131
Miscellaneous Line Key Settings	132
Line Key LED Pattern	132
Supplementary Services	133
Ring Tone	134
Auto Input Gain (dB)	135
Background Picture (SPA 962)	135
Ext 1/2/3/4/5/6 Tab	136
General	136
Share Line Appearance	136
NAT Settings	137
Network Settings	137
SIP Settings	138
Call Feature Settings	140
Proxy and Registration	141
Subscriber Information	142
Audio Configuration	143
Dial Plan	145
User Tab	147
Call Forward	147
Speed Dial	148
Supplementary Services	148
Audio Volume	149
Phone GUI Menu Color Settings (SPA962)	149
A	151
Acronyms	151
B	155
Glossary	155

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1-6

Linksys 900 Series IP Phone Administrator Guide

Document Version 3.0

Chapter 1

Introducing Linksys 900 Series IP Phones

Feature Descriptions

SPA900 Series IP phones are full featured, fully programmable IP phones that can be custom

provisioned within a wide range of configuration parameters. This chapter contains a

high-level overview of features to provide a basic understanding of the feature breadth and

capabilities of SPA900 Series IP phones.

•

SIP Proxy Redundancy, page 1-8

•

Supported Codecs, page 1-8

•

Other Features, page 1-9

SIP Proxy Redundancy

In typical commercial IP Telephony deployments, all calls are established through a SIP proxy

server. An average SIP proxy server may handle tens of thousands of subscribers. It is

important that a backup server be available so that an active server can be temporarily switched

out for maintenance. SPA900 Series IP phones support the use of backup SIP proxy servers so

that service disruption should be nearly eliminated.

A simple way to support proxy redundancy is to configure a static list of SIP proxy servers in

the SPA900 Series IP phone configuration profile, where the list is arranged in order of priority.

The SPA900 Series IP phone attempts to contact the highest priority proxy server whenever

possible.

The dynamic nature of SIP message routing makes the use of a static list of proxy servers

inadequate in some scenarios. In deployments where user agents are served by different

domains, for instance, it would not be feasible to configure one static list of proxy servers per

covered domain into every SPA900 Series IP phone. One solution to this situation is through

the use of DNS SRV records. SPA900 Series IP phones can be instructed to contact a SIP proxy

server in a domain named in SIP messages. The SPA900 Series IP phone consults the DNS

server to get a list of hosts in the given domain that provides SIP services. If an entry exists,

the DNS server returns an SRV record that contains a list of SIP proxy servers for the domain,

with their host names, priority, listening ports, and so on. The SPA900 Series IP phone tries to

contact the list of hosts in the order of their stated priority.

If the SPA900 Series IP phone is currently using a lower priority proxy server, it periodically

probes the higher priority proxy to see whether it is back on line, and attempts to switch back

to the higher priority proxy whenever possible.

Supported Codecs

Negotiation of the optimal voice codec sometimes depends on the ability of SPA900 Series IP

phone to “match” a codec name with the far-end device/gateway codec name. SPA900 Series

IP phones allow the network administrator to individually name the various codecs that are

supported such that the correct codec successfully negotiates with the far-end equipment.