C H A P T E R 2 SIP Protocol Subscriber Features With Release 4.4, Cisco BTS 10200 supports SIP subscribers such as SIP phones compliant with RFC 3261 or RFC 2543. The SIP protocol support in Cisco BTS 10200 provides the capability to provision subscriber features, and to allow SIP devices to work with the Cisco BTS 10200 Softswitch. This chapter describes the subscriber features. For quick-reference tables listing the Subscriber features, see Chapter 1.
Chapter 2 SIP Protocol Subscriber Features SIP Devices The following Cisco SIP devices, when running a SIP application image, are supported on Cisco BTS 10200: • Cisco ATA 186/188 • Cisco IP Phone 7905 • Cisco IP Phone 7912 • Cisco IP Phone 7940 • Cisco IP Phone 7960 For more information on provisioning devices, refer to the Provisioning SIP Devices section in the Cisco BTS 10200 SIP Protocol Provisioning Guide.
Chapter 2 SIP Protocol Subscriber Features The Cisco BTS 10200 generates a warning event when a request from a client fails authentication.This can be indicative of a provisioning error, or of an attempt by an unauthorized client to communicate with the Cisco BTS 10200. The contacts registered for an AOR may be looked up using the status CLI command, as demonstrated by the following example. CLI>status sip-reg-contact AOR_ID=4692551884@sia-SYS44CA146.ipclab.cisco.com AOR ID -> 4692551884@sia-SYS44CA146.
Chapter 2 SIP Protocol Subscriber Features SIP User Authentication In this release, Cisco BTS 10200 can act as an authentication server. Authentication is enabled on the serving domain through provisioning. Whenever a SIP request is received from a SIP subscriber, the request is authenticated to ensure it is indeed from an identified user. Authentication also enables request authorization, since users may be authorized to perform only specific requests.
Chapter 2 SIP Protocol Subscriber Features Cisco BTS 10200 Softswitch-Based Features Figure 2 shows how an incoming request is processed, and the role of the Authentication Service in the Cisco BTS 10200. Figure 2 Authentication and Processing of an Incoming Request (e.g.
Chapter 2 SIP Protocol Subscriber Features Cisco BTS 10200 Softswitch-Based Features ACR has multiple activation options as follows: • Activated permanently at subscription time by service provider—When ACR is first provisioned by the service provider, it is active immediately by default. To assign this feature in the deactivated state, configure the subscriber-feature-data table for that subscriber to make ACR deactivated.
Chapter 2 SIP Protocol Subscriber Features Cisco BTS 10200 Softswitch-Based Features Call Forwarding Activation and Deactivation Activation and deactivation of call forwarding features uses the star code. Alternately, the feature may be activated or deactivated by using the Services key on certain phones. With SIP support, the call forwarded to number can be a Centrex extension number (only applicable for business users) or an E.164 number. Note Forwarding to a URL (AOR) is not supported in Release 4.4.
Chapter 2 SIP Protocol Subscriber Features Cisco BTS 10200 Softswitch-Based Features Caller ID Delivery Suppression The treatment for caller’s identity is based on presence of “anonymous” in the Display-Name field of From header in the INVITE. Caller Identity presentation (allowed/restricted) information for SIP subscribers is not maintained in the Cisco BTS 10200 Softswitch database. This information is maintained on the individual phones, and can be provisioned through the phones’ softkeys.
Chapter 2 SIP Protocol Subscriber Features Cisco BTS 10200 Softswitch-Based Features feature_server_id=FSPTC235; And at the Subscriber feature level: add subscriber-feature-data sub_id=sip_sub2;FNAME=CFU;type2=RR;VALUE2=N Note • Call forwarding on no answer variable activation (CFNAVA), call forwarding on no answer variable deactivation (CFNAVD), call forwarding on no answer interrogation (CFNAI) • Call forwarding on busy variable activation (CFBVA), call forwarding on busy variable deactivation (CFB
Chapter 2 SIP Protocol Subscriber Features Cisco BTS 10200 Softswitch-Based Features 2. Receiving a second dial tone 3. Dialing the external number (i.e., outside the customer group) Access to the DOD feature is subject to station restrictions. Note For IP phones, the second dial tone is provided by the phone itself. However, the prefix code is presented to the Cisco BTS 10200 along with the DDD number in the INVITE message. Secondary dial-tone capability is dependent on the SIP device used.
Chapter 2 SIP Protocol Subscriber Features Cisco BTS 10200 Softswitch-Based Features The number of digits used for Centrex dialing can be provisioned within a range of 1 through 7 digits. Incoming and Outgoing Simulated Facility Group This feature was introduced in a previous Cisco BTS 10200 Softswitch release. There are no differences when provisioning the feature for SIP.
Chapter 2 SIP Protocol Subscriber Features Cisco BTS 10200 Softswitch-Based Features Remote Activation of Call Forwarding This feature was introduced in a previous Cisco BTS 10200 Softswitch release. There are no differences when provisioning the feature for SIP. For information, refer to the Remote Activation of Call Forwarding section in the Cisco BTS 10200 Softswitch System Description guide.
Chapter 2 SIP Protocol Subscriber Features Phone-Based Features The ToS value for messages sent to SIP subscribers can be set on a system-wide basis—this applies to all subscribers. The policy is selected in the CA-CONFIG table. The Cisco BTS 10200 reads the values from this table when it starts up. Therefore, changes to the ToS policy for SIP subscribers become effective at the next restart of the Cisco BTS 10200.
Chapter 2 SIP Protocol Subscriber Features Jointly-Provided Features Jointly-Provided Features In addition to the Softswitch-based and phone-based features, Release 4.4 also offers jointly-provided features. These are features provided jointly by the phone and by the Cisco BTS 10200. To use these features, you must provision both the phone and the Cisco BTS 10200.
Chapter 2 SIP Protocol Subscriber Features Jointly-Provided Features When session timer is enabled for the SIP subscriber and an initial INVITE is received by Cisco BTS 10200 without a Supported header with ‘timer’ value or a Session-Expires header, a 200 class response is sent without a Require header with ‘timer’ value, or a Session-Expires header. Cisco BTS 10200 sends periodic refresh request at half the negotiated session duration.
Chapter 2 SIP Protocol Subscriber Features Jointly-Provided Features For calls sent out a Cisco BTS 10200 regular SIP trunk, the following feature behavior applies: • If the feature is provisioned enabled on the trunk, the SIP Invite message sent contains a ‘Required’ header with a tag value of ‘100rel.’ • If the feature is enabled on the trunk, and the remote endpoint supports or requires the feature, all provisional responses are sent reliably to Cisco BTS 10200.
Chapter 2 SIP Protocol Subscriber Features Jointly-Provided Features Supported Features The following features have SIP client/handset based provisioning support: • Call forwarding unconditional activation (CFUA), call forwarding unconditional deactivation (CFUD) • Call forwarding on busy variable activation (CFBVA), Call forwarding on busy variable deactivation (CFBVD) • Call forwarding on no answer variable activation (CFNAVA), call forwarding on no answer variable deactivation (CFNAVD) • Do Not
Chapter 2 SIP Protocol Subscriber Features Jointly-Provided Features Do Not Disturb Activate/Deactivate Feature SIP Software Clients The user interface for applicable software clients is similar to a SIP handset. Call Transfer (Blind and Attended) The SIP call transfer (CT) feature is supported for SIP subscribers on Cisco BTS 10200 Release 4.4. Call transfer in Cisco BTS 10200 requires provisioning the “REFER” feature as an office trigger.
Chapter 2 SIP Protocol Subscriber Features Independently Provided Features Independently Provided Features Independently provided features are available on both the phones and the Cisco BTS 10200. You can provision either device to enable the feature. One example of the feature is Do Not Disturb (DND). DND is a Softswitch-provided feature that also can be provisioned on the phone.
Chapter 2 SIP Protocol Subscriber Features Independently Provided Features Cisco BTS 10200 Softswitch SIP Protocol User Guide 2-20 OL-5352-03
