|
|
This section provides information about key basic and additional SIP services that the Cisco ATA supports:
 |
Note The term Cisco ATA refers to both the Cisco ATA 186 and the Cisco ATA 188, unless otherwise stated. |
This section provides descriptions and cross references for configuring required SIP parameters and also for configuring other important basic SIP services:
If the UseSIP parameter is set to 1 (you are using the SIP protocol), you need to supply values for the required SIP parameters shown in Table 4-1. The Parameter column provides the name of the parameter and a cross reference which provides a more-detailed description of the parameter.
|
Note See "Parameters and Defaults," for information about additional Cisco ATA parameters. |
Table 4-1 Required SIP Parameters and Defaults
The Cisco ATA supports two levels of authentication, depending on the setting of the UseLoginID parameter:
The LBRCodec (low-bit-rate codec) parameter determines whether the G.723 or G.729A codec, in addition to G.711A-law and G.711µ-law, can be used for receiving and transmitting. For configuration information, see the "LBRCodec" section.
When the value specified in the CfgInterval parameter is reached, the Cisco ATA attempts to refresh its configuration file from the TFTP server. By opening a web page for the Cisco ATA, you can perform a refresh before the scheduled refresh. Set the CfgInterval parameter to an interval value (in seconds) for refreshing the Cisco ATA configuration file. Cisco recommends that the interval be semi-random to prevent many simultaneous contacts with the TFTP server. For more information, see the "CfgInterval" section.
When the Cisco ATA contacts the TFTP server, it also checks to see if an upgrade signaling image has been placed on the TFTP server. If such an image exists, the Cisco ATA will download this image.
This section describes additional SIP services and, where applicable, provides configuration information and cross references to the parameters for configuring these services. These services are listed alphabetically.
The UDPTOS (specifies the default IP precedence of UDP packets) and AudioMode (audio operating mode) parameters allow you to tune audio configuration.
You can customize specific features on a subscription basis by changing the values of specific bits in several different parameters. Table 4-2 contains a list of billable features and their related parameters:
|
Note CallWaitCallerID is an obsolete parameter. Do not use it. |
When silence suppression is turned on in ITU G.711, the Cisco ATA calculates and transmits its noise level to the far end to enable the remote endpoint to generate the appropriate amount of comfort noise. This provides the remote user with a similar experience to that of a PSTN call and prevents silent gaps when neither party is talking.
AudioMode—Bit 0 disables/enables silence suppression.
This feature provides the ability to adjust the hook-flash timing to meet local requirements.
SigTimer—Bits 26 and 27 are for configuring the minimum on-hook time required for a hook flash event, and bits 28 through 31 are for configuring maximum on-hook time.
This feature allows the call-waiting tone to be mixed with the audio in an active call. Therefore, the call-waiting tone will sound without a pause in the audio.
ConnectMode—Bit 24
This feature is available only for the recipient (callee) of a call. If the callee picks up the phone and then later hangs up to retrieve another call, the hang-up is not considered on-hook until the specified delay expires.
FeatureTimer—Bits 8 to 12
You can use the following parameters to troubleshoot operation issues:
You can set specific dial plan rules and timeout values. Many of these values are determined on a country-by-country basis.
To prevent tampering and unauthorized access to the Cisco ATA configuration, the Cisco ATA built-in web server can be disabled.
OpFlags—Bit 7
This feature allows a user to identify a caller based on the ringing pattern the user selects for the incoming number.
This feature is dependent on the proxy or remote UA, including the Alert-Info header with the appropriate value in the INVITE message. The Cisco ATA supports standard distinctive ringing pattern 1 to 5 as defined in the standard GR-506-CORE.
The following Alert-Info header values are allowed:
If the Alert-Info header value is not recognized, the Cisco ATA plays the regular ring tone, Bellcore-dr1.
|
Note The Bellcore-dr5 ringing pattern is the same as the Bellcore-dr1 ringing pattern. |
The Cisco ATA supports DNS SRV lookup for the SIP proxy server. If the GkOrProxy parameter value begins with _sip._udp. or sip.udp., the Cisco ATA performs a DNS SRV lookup for the SIP proxy server. A DNS SRV lookup results in one of the following conditions:
Cisco ATA hardware information is displayed in the lower-left corner of the Cisco ATA Web configuration page.
Network Address Translation (NAT) supports port mapping and forwarding to standard default SIP signaling port 5060 and media base port 16384, or other ports as configured in the Cisco ATA. Media ports are evenly numbered from the base port. NAT must support multiple port mappings. The Cisco ATA can use up to four media ports to handle conference calls on both lines. For example, if media base port 16384 is used for one call, the next call uses port 16386 and other calls will use ports 16388 and 16390.
|
Note Routers such as D-Link, WinRoute, and WinProxy may not route correctly if both caller and callee are behind the same NAT. |
To configure the Cisco ATA to work in a NAT environment, modify the following parameters:
To maintain Network Address Translation/Port Address Translation (NAT/PAT) for a session, the Cisco ATA can be configured to periodically send a dummy UDP packet to a server (the Cisco ATA does not expect any response from the server).
You can fine tune your network timing with the following parameters:
If the OutBoundProxy parameter is a fully qualified domain name (FQDN), and DNS returns multiple IP addresses, the first IP address is used as the primary outbound proxy and the second IP address as the secondary outbound proxy. If OutBoundProxy is an IP address or if DNS returns only one IP address, then a backup outbound proxy is not available. The AltGkTimeOut parameter determines the backup proxy timeout value for the outbound proxy.
If the backup proxy fails, the Cisco ATA automatically switches back to the primary proxy if the unit has been using the backup proxy for at least 30 seconds. This effectively prevents the Cisco ATA from switching indefinitely between failing primary and failing backup proxies for the same transactions.
Switching between primary and secondary proxies can occur only for initial INVITE and REGISTER requests. Other requests, such as CANCEL, BYE, ACK, and re-INVITE, do not retry the backup proxy but give up if the current proxy fails.
When OutBoundProxy is enabled, the Cisco ATA determines whether to retry to connect with the backup OutBoundProxy or backup SIP proxy if the INVITE or REGISTER requests fail. If the reason for failure is an ICMP error (such as an unreachable host), the Cisco ATA retries with the backup outbound proxy. If failure is due to timeout while waiting for a response or a 5xx response, the Cisco ATA retries the backup SIP proxy.
Values for the following parameters (all defined in the "Call-Progress Tone Parameters" section) must be determined based on the country in which the Cisco ATA is located:
You can disable or enable the processing the received = parameter in the Via header. This feature is disabled by default.
ConnectMode—Bit 22
This feature allows the Cisco ATA to repeatedly call a busy number at a periodic interval for a specific length of time. Both the interval and total time can be specified by the user.
To use this feature, configure FeatureTimer bits 0-7 and add the new command/action values "#37#;kA" to the existing "H" context and "5;jA" to the existing "S" context in the CallCmd parameter.
This feature is invoked by pressing 5 after the busy tone sounds. The caller then gets a beep confirmation followed by silence. When the subscriber hangs up, the Cisco ATA starts to redial at the interval specified in FeatureTimer bits 4-7. When the called party rings, the caller is notified with a special ring. If the called party picks up the call first, the called party receives a ringback. If the caller picks up the call first, the caller receives the ringback. This feature is automatically cancelled when the called party rings.
|
Note For this feature to work properly, the remote user agent server must return a 486 (Busy Here) response to an INVITE request if it detects that the remote party (IP or PSTN) is busy. If the server returns a 183 (Session Progress) response with an SDP before a 486, the Cisco ATA considers the call successful and automatically cancels repeat dialing. |
SIP proxy server redundancy can be enabled by entering a fully qualified domain name (FQDN) or IP address (and optional port number) in the GkOrProxy and AltGk parameters, and by configuring the AltGkTimeOut parameter. If you provide hostnames for GkOrProxy or AltGk, the names are resolved by the configured DNS. DNS results are hard-coded in cache memory for 10 minutes.
If DNS returns multiple IP addresses, the Cisco ATA uses only the first IP address. If AltGk is set to 0 (disabled) and DNS returns two or more IP addresses for GkOrProxy, then the Cisco ATA uses the first IP address as the primary proxy and the second IP address as the secondary proxy. If GkOrProxy is an IP address or DNS returns one IP address, then the backup SIP proxy is not available. A special case exists if GkOrProxy and AltGk are the same values and are not IP addresses. In this case, the AltGk parameter is assumed to have the value 0.
If unconditional call forwarding is enabled, the Cisco ATA plays a continuous stuttering dial tone when the telephone handset is picked up. This reminds the user that all incoming calls are forwarded to another number. For more information, see the "Call Forwarding in the United States" section and the "Call Forwarding in Sweden" section.
This feature allows you to specify the default call-waiting setting for every call on a permanent basis by means of the service activation and deactivation codes.
ConnectMode—Bit 23
This feature allows you to specify the timeout before a call is forwarded to another number on no answer.
This feature is activated by entering the service activation code followed by the phone number and delay. The entry sequence is as follows:
Delay can be from 1 to 255 seconds. If the delay is zero (0) or not provided by the user, the delay specified in the SigTimer parameter (bits 20-25), which has a default value of 20 seconds, is in effect.
Using the U.S. Call Command parameter string, the U.S. service activation code is #75 and the deactivation code is #73.
To forward calls to the number 555-1212 after a no-answer for 15 seconds, enter the following:
To deactivate this feature, enter the following:
SigTimer—Bits 20 to 25
The Cisco ATA supports direct IP-to-IP calls without using a SIP proxy. When a call is placed, the Cisco ATA sends the INVITE request directly to the remote user agent and exepcts the usual 100/180/200 responses from the user agent.
This section contains the following topics:
To perform the necessary configuration of the Cisco ATA, follow this procedure:
Step 2 Enter the URL: http://< Cisco_ATA_IP_address>/dev
where Cisco_ATA_IP_address is the IP address of your Cisco ATA. This takes you to the Cisco ATA Web configuration page.
Step 3 Configure the following parameters as shown:
Step 4 Click the Apply button to save these changes.
To place an IP call, dial the telephone number and the IP address of the remote user agent. The dial format is shown below:
Use the star (*) key on the telephone keypad to represent the dot (.) in an IP address. Use the pound (#) key on the telephone keypad to terminate the dial string and place the call.
|
Note URL dialing is not supported. |
To place a call to a user agent with an ID of 408-555-1212 at IP address 192.168.1.100, you would enter the following string on your telephone keypad:
Table 4-3 is a reference table that lists all configurable features for the Cisco ATA (using SIP), and includes links to the detailed descriptions of the parameters used for configuring these features.
Table 4-3 Configurable Features and Related Parameters
|
Posted: Fri Aug 1 11:02:46 PDT 2003
All contents are Copyright © 1992--2003 Cisco Systems, Inc. All rights reserved.
Important Notices and Privacy Statement.