Configure audio settings
You can configure the volume settings in the phone web interface.
You can also configure the parameters in the phone configuration file with XML (cfg.xml) code. To configure each parameter, see the syntax of the string in the following table of Parameters for audio volume.
1 |
Access the phone administration web page. |
2 |
Select . |
3 |
In the Audio Volume section, configure the volume level for audio parameters as described in the following table of Parameters for audio volume. |
4 |
Click Submit All Changes. |
Parameters for audio volume
The following table defines the function and usage of Audio Volume parameters in the Audio Volume section under the tab in the phone web interface. It also defines the syntax of the string that is added in the phone configuration file with XML(cfg.xml) code to configure a parameter.
Parameter |
Description |
---|---|
Ringer Volume |
Sets the default volume for the ringer. Perform one of the following:
Allowed values: an integer ranging between 0 and 15 Default: 9 |
Speaker Volume |
Sets the default volume for the speakerphone. Perform one of the following:
Allowed values: an integer ranging between 0 and 15 Default: 11 |
Handset Volume |
Sets the default volume for the handset. Perform one of the following:
Allowed values: an integer ranging between 0 and 15 Default: 10 |
Headset Volume |
Sets the default volume for the headset. Perform one of the following:
Allowed values: an integer ranging between 0 and 15 Default: 10 |
Bluetooth Volume |
Sets the default volume for the Bluetooth device. Perform one of the following:
Allowed values: an integer ranging between 0 and 15 Default: 9 |
Electronic Hookswitch Control |
Enables or disables the Electronic HookSwitch (EHS) feature. After EHS is enabled, the AUX port does not output phone logs. Perform one of the following:
Allowed values: Yes|No Default: No |
A codec resource is considered allocated if it has been included in the SDP codec list of an active call, even though it eventually might not be chosen for the connection. Negotiation of the optimal voice codec sometimes depends on the ability of the Cisco IP Phone to match a codec name with the far-end device or gateway codec name. The phone allows the network administrator to individually name the various codecs that are supported such that the correct codec successfully negotiates with the far-end equipment.
The Cisco IP Phone supports voice codec priority. You can select up to three preferred codecs. The administrator can select the low-bit-rate codec that is used for each line. G.711a and G.711u are always enabled.
You can also configure the parameters in the phone configuration file with XML(cfg.xml) code. To configure each parameter, see the syntax of the string in the following table of Audio codeck parameters.
1 |
Access the phone administration web page. |
2 |
Select , where n is an extension number. |
3 |
In the Audio Configuration section, configure the parameters as defined in the following table of Audio codeck parameters. |
4 |
Click Submit All Changes. |
Audio codec parameters
The following table defines the function and usage of the voice codec parameters in the Audio Configuration section under the tab in the phone web interface. It also defines the syntax of the string that is added in the phone configuration file (cfg.xml) with XML code to configure a parameter.
Parameter |
Description |
---|---|
Preferred Codec |
Preferred codec for all calls. The actual codec used in a call still depends on the outcome of the codec negotiation protocol. Perform one of the following:
Allowed values: G711u|G711a|G729a|G722|G722.2|iLBC|iSAC|OPUS Default: OPUS |
Use Pref Codec Only |
Select No to use any code. Select Yes to use only the preferred codes. When you select Yes, calls fail if the far end does not support the preferred codecs. Perform one of the following:
Allowed values: Yes|No Default: No |
Second Preferred Codec |
Codec to use if the codec specified in Preferred Codec fails. Perform one of the following:
Allowed values: Unspecified|G711u|G711a|G729a|G722|G722.2|iLBC|iSAC|OPUS Default: Unspecified |
Third Preferred Codec |
Codec to use if the codecs specified in Preferred Codec and Second Preferred Codec fail. Perform one of the following:
Allowed values: Unspecified|G711u|G711a|G729a|G722|G722.2|iLBC|iSAC|OPUS Default: Unspecified |
G711u Enable G711a Enable G729a Enable G722 Enable G722.2 Enable iLBC Enable iSAC Enable OPUS Enable |
Enables the use of a specific codec. Perform one of the following:
The transmit rate for the G.729a codec is at 8 kbps. |
Silence Supp Enable |
Enables or disables silence suppression. When set Yes, silent audio frames are not transmitted. Perform one of the following:
Allowed values: Yes|No Default: No |
DTMF Tx Method |
The method for transmitting DTMF signals to the far end. The options are:
Perform one of the following:
Default: Auto |
Codec Negotiation |
When set to Default, the phone responds to an Invite with a 200 OK response advertising the preferred codec only. When set to List All, the phone responds listing all the codecs that the phone supports. Perform one of the following:
Allowed values: Default|List All Default: Default |
Encryption Method |
Encryption method to be used during secured call. Options are AES 128 and AES 256 GCM Perform one of the following:
Allowed values: AES 128 |AES 256 GCM Default: AES 128. |
You can capture voice quality metrics for Voice over Internet Protocol (VoIP) sessions with a Session Initiation Protocol (SIP) event package. Voice call quality information derived from RTP and call information from SIP is conveyed from a User Agent (UA) in a session (reporter) to a third party (collector).
The phone uses User Datagram Protocol (UDP) to send a SIP PUBLISH message to a collector server.
Currently, only the basic call scenario supports voice quality reporting. A basic call can be a peer to peer incoming or outgoing call. The phone supports periodic SIP publish message.
Mean Opinion Scores and Codecs
The voice quality metrics use Mean Opinion Score (MOS) to rate the quality. A MOS rating of 1 is the lowest quality; a MOS rating of 5 is the highest quality. The following table gives a description of some of the codecs and MOS scores. The phone supports all codecs. For all codecs, the phone sends the SIP Publish message.
Codec |
Complexity and Description |
MOS |
Minimum Call Duration for Valid MOS Value |
---|---|---|---|
G.711 (A-law and u-law) |
Very low complexity. Supports uncompressed 64 kbps digitized voice transmission at one to ten 5 ms voice frames-per-packet. This codec provides the highest voice quality and uses the most bandwidth of any of the available codecs. |
A minimum value of 4.1 indicates good voice quality. |
10 seconds |
G.729A |
Low to medium complexity. |
A minimum value of 3.5 indicates good voice quality. |
30 seconds |
G.729AB |
Contains the same reduced complexity modifications present in the G.729A. |
A minimum value of 3.5 indicates good voice quality. |
30 seconds |
Configure voice quality reporting
You can generate a voice quality report for each extension on the phone. The parameters for the Voice Quality Metrics (VQM) SIP Publish Message help you to:
-
Generate voice quality reports.
-
Name your reports.
-
Determine when your phone sends SIP Publish messages.
You can also configure the parameters in the phone configuration file with XML(cfg.xml) code. See the syntax in the following table of VQM SIP Publish Message parameters.
1 |
Access the phone administration web page. |
2 |
Select , where (n) is the extension number. |
3 |
In SIP Settings, enter a value for the Voice Quality Report Address parameter. You can enter either a domain name or an IP address. You can also add a port number along with the domain name or an IP address for this parameter. If you do not enter a port number, the value of the SIP UDP Port (5060) is used by default. If the collector server URL parameter is blank, a SIP PUBLISH message is not sent out. |
4 |
Enter your report name for the Voice Quality Report Group parameter. Your report name can't begin with a hyphen (-), semicolon (;), or a space.
|
5 |
Enter an interval, in seconds, for the Voice Quality Report Interval parameter. Example: |
6 |
Click Submit All Changes. |
VQM SIP Publish Message parameters
Parameter Name |
Description |
---|---|
Voice Quality Report Address |
Allows you to enter one of the following options:
In the phone XML configuration file (cfg.xml), enter a string in this format:
Default parameter = empty (no report) Default SIP UDP Port = 5060 |
Voice Quality Report Group |
Allows you to enter a voice quality report name. Your report name cannot begin with a:
In the phone XML configuration file (cfg.xml), enter a string in this format:
Default parameter = empty (The report will use the canonical name in the form of |
Voice Quality Report Interval |
Allows you to determine when the phones send SIP Publish messages. If you have properly configured the Voice Quality Report Address, the SIP Publish messages can be sent:
In the phone XML configuration file (cfg.xml), enter a string in this format:
Default parameter = 0 (no periodic SIP Publish Message) |