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Administrator’s Guide for SIP-T2xP IP Phones
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DTMF
DTMF (Dual Tone Multi-frequency), better known as touch-tone, is used for
telecommunication signaling over analog telephone lines in the voice-frequency band.
DTMF is the signal sent from the IP phone to the network, which is generated when
pressing the IP phone’s keypad during a call. Each key press on the IP phone generates
one sinusoidal tone of two frequencies. One is generated from a high frequency group
and the other from a low frequency group.
The DTMF keypad is laid out in a 4×4 matrix, with each row representing a low
frequency, and each column representing a high frequency. Pressing a digit key (such
as '1') will generate a sinusoidal tone for each of two frequencies (697 and 1209 hertz
(Hz)).
DTMF Keypad Frequencies:
1209 Hz
1336 Hz
1447 Hz
1633 Hz
697 Hz
1
2
3
A
770 Hz
4
5
6
B
852 Hz
7
8
9
C
941 Hz
*
0
#
D
Three methods of transmitting DTMF digits on SIP calls:
RFC 2833 -- DTMF digits are transmitted by RTP Events compliant to RFC 2833.
INBAND -- DTMF digits are transmitted in the voice band.
SIP INFO -- DTMF digits are transmitted by SIP INFO messages.
The method of transmitting DTMF digits is configurable on a per-line basis.
RFC 2833
DTMF digits are transmitted using the RTP Event packets that are sent along with the
voice path. These packets use RFC 2833 format and must have a payload type that
matches what the other end is listening for. The payload type for RTP Event packets is
configurable. IP phones default to 101 for the payload type, which use the definition to
negotiate with the other end during call establishment.
The RTP Event packet contains 4 bytes. The 4 bytes are distributed over several fields
denoted as Event, End bit, R-bit, Volume and Duration. If the End bit is set to 1, the
packet contains the end of the DTMF event. You can configure the number of times the
IP phone sends the RTP Event packet with End bit set to 1.
INBAND
DTMF digits are transmitted within the audio of the IP phone conversation. It uses the
- Copyright 2
- Warranty 2
- Declaration of Conformity 2
- CE Mark Warning 2
- WEEE Warning 3
- Customer Feedback 3
- GNU GPL INFORMATION 4
- About This Guide 5
- Summary of Changes 6
- Table of Contents 11
- Table of 13
- Contents 13
- Product Overview 17
- SIP Components 18
- SIP IP Phone Models 19
- SIP-T28P 20
- SIP-T26P 21
- SIP-T22P 22
- SIP-T20P 23
- Phone Features 24
- Codecs and Voice Features 24
- Network Features 24
- Management 24
- Security 25
- Getting Started 27
- 1) Attach the stand: 28
- Getting Started 29
- Verifying Startup 31
- Configuration Methods 32
- Reading Icons 34
- DHCP Option 35
- Auto-negotiation 42
- Half-duplex 42
- Full-duplex 42
- Auto-negotiation 43
- Half-duplex 43
- Full-duplex 43
- Configuring PC Port Mode 45
- Creating Dial Plan 47
- Replace Rule 48
- Block Out 52
- Configuring Basic Features 54
- Daylight Saving Time 64
- field 65
- Softkey Layout 73
- Local Directory 82
- Return Message When DND 97
- Busy Tone Delay 101
- Return Code When Refuse 102
- Early Media 103
- 180 Ring Workaround 103
- Procedure 104
- Use Outbound Proxy in Dialog 105
- SIP Session Timer 106
- Session Timer 107
- Call Hold 109
- Call Forward 111
- Call Transfer 116
- Network Conference 117
- Directed Call Pickup 119
- Group Call Pickup 122
- Dialog-Info Call Pickup 126
- Call Return 128
- Call Park 129
- Web Server Type 130
- RFC 2833 134
- Suppress DTMF Display 137
- Transfer via DTMF 138
- Intercom 139
- Incoming Intercom Calls 140
- Distinctive Ring Tones 143
- Configuring Advanced 147
- Features 147
- Remote Phone Book 149
- LDAP Attributes 152
- Busy Lamp Field 154
- Music on Hold 158
- Automatic Call Distribution 159
- Message Waiting Indicator 161
- Multicast Paging 163
- Receiving RTP Stream 165
- Call Recording 167
- URL Record 168
- Hot Desking 171
- Action URL 172
- Action URI 176
- Server Redundancy 179
- Phone Registration 180
- VLAN Discovery via DHCP 189
- Quality of Service 193
- Voice QoS 194
- SIP QoS 194
- Network Address Translation 196
- 802.1X Authentication 199
- TR-069 Device Management 205
- IPv6 Support 207
- Configuring Audio Features 211
- Dual Headset 212
- Audio Codecs 213
- Packetization Time 214
- Acoustic Clarity Technology 217
- Voice Activity Detection 218
- Comfort Noise Generation 219
- Jitter Buffer 220
- Transport Layer Security 223
- Certificates 225
- Upgrading Firmware 235
- Resource Files 239
- Dial-now Template 240
- Softkey Layout Template 241
- Local Contact File 243
- Remote XML Phone Book 244
- Troubleshooting 247
- Capturing Packets 250
- Enabling Watch Dog Feature 251
- Analyzing Configuration File 252
- Troubleshooting Solutions 253
- Appendix 261
- Appendix B: Time Zones 263
- Static Network Settings 267
- PC Port Transmission Method 271
- PC Port Mode 272
- Dial Plan 274
- Dial-now 275
- Area Code 276
- Contrast 278
- Backlight 279
- User Password 280
- Administrator Password 280
- Phone Lock 280
- Time and Date 282
- Configuration File 286
- ) of DST 286
- Language 287
- Logo Customization 289
- Key as Send 291
- Hotline 292
- Call Log 293
- Missed Call Log 293
- Live Dialpad 294
- Call Waiting 295
- Auto Redial 296
- Auto Answer 297
- Call Completion 297
- Anonymous Call 298
- Anonymous Call Rejection 299
- Do Not Disturb 301
- DND in Phone Mode 302
- DND in Custom Mode 302
- Call Forward in Phone Mode 310
- Always Forward 310
- Busy Forward 311
- No Answer Forward 312
- Call Forward in Custom Mode 314
- Fwd International 318
- Phone Basis 321
- Per-line Basis 322
- Incoming Intercom calls 330
- Sending RTP Stream 347
- Fallback Mode 353
- Failover Mode 353
- TCP or TLS 356
- Internet Port 357
- PC Port 358
- DHCP VLAN Discovery 359
- Audio Feature Parameters 372
- Acoustic Echo Cancellation 376
- Security Feature Parameters 379
- Uploading Certificates 381
- Watch Dog 391
- Configuring DSS Key 392
- Keypad Lock Key 397
- DND Key 397
- Directed Call Pickup Key 398
- Group Call Pickup Key 399
- Call Return Key 401
- Call Park Key 401
- Intercom Key 403
- LDAP Key 404
- BLF Key 404
- ACD Key 406
- Multicast Paging Key 407
- Record Key 408
- URL Record Key 408
- Hot Desking Key 409
- SIP Request 411
- SIP Header 412
- SIP Responses 413
- Appendix E: SIP Call Flows 416
- Always Call Forward 443
- Busy Call Forward 446
- No Answer Call Forward 449
- Call Conference 452
- Network Settings 457
- Dial Plan Settings 457
- #Time Settings 458
- #Auto DST Settings 458
- #Phone Lock 458
- #Language 458
- #Call Waiting 458
- #Hotline 459
- #Web Server Type 459
- #DTMF Suppression 459
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