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Cisco BTS 10200 Softswitch SIP Protocol User Guide
OL-5352-03
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.
SIP Endpoint Caveats
The following Cisco BTS 10200 supported supplementary features have caveats when compared with an
MGCP endpoint behavior for the same feature:
• 911—Only E911 (without the suspend procedure for 45 minutes) support. Basic 911 with suspend
procedure is not supported.
• Call transfer (CT)—For SIP phones, this feature is provided as part of REFER support on
Cisco BTS 10200. See REFER feature below for more details.
• Distinctive alerting call waiting indication (DACWI)—Ringing part supported by
Cisco BTS 10200. Cisco BTS 10200 sends distinctive alerting request for Call Waiting scenario.
Some SIP phones interpret it, and play distinctive call-waiting tone; other phones do not.
• Distinctive ringing/call waiting (DRCW)—Ringing part supported by Cisco BTS 10200.
Cisco BTS 10200 sends distinctive alerting request for Call Waiting scenario. Some SIP phones
interpret it, and play distinctive call waiting tone; other phones do not.
• Multiple directory numbers (MDN)—Ringing part supported by Cisco BTS 10200.
Cisco BTS 10200 sends distinctive alerting request for Call Waiting scenario. Some SIP phones
interpret it, and play distinctive call waiting tone; other phones do not.
• Call waiting deluxe activation (CWDA), call waiting deluxe activation (CWDD), and call waiting
deluxe interrogation (CWDI)—Depends on whether functionality is supported by the phone.
• Account-code/Auth-code capability is not supported for the Class of service feature offered to SIP
subscribers. However, this capability is available to MGCP subscribers.
SIP Subscriber to SIP Calls
SIP subscribers must present valid credentials on a SIP INVITE message in order to place calls.
In Release 4.4, Cisco BTS 10200 allows SIP subscribers to call other SIP subscribers or SIP trunks
connected to Cisco BTS 10200. The provisioned dial plan determines whom a subscriber may call. A
SIP subscriber may receive a call as long as the subscription’s registration is current, or a static
registration has been provisioned. A SIP subscriber may call any SIP endpoint hosted by a trunk that was
provisioned on Cisco BTS 10200.
Type of Service
The SIP Type of Service (ToS) feature provides the ability to configure the Cisco BTS 10200 such that
SIP signaling traffic is sent at a desired priority over IP. This is important because SIP messages travel
over the same network as the voice traffic. If this network is congested, the voice data may delay the SIP
signaling packets, causing unnatural delay when calls are set up. Raising the SIP packets priority in
relation to other traffic reduces the delay.