SIP Compliance and Interoperability
This appendix lists examples of Session Initiation Protocol (SIP) services and features and the type of support provided by Cisco Unified Border Element (SP Edition).
SIP Features and SBC Compliance
The following table lists some examples of SIP services and features and extent of interoperability and compliance provided by Cisco Unified Border Element (SP Edition) on the unified model.
Many of the SIP services or features in the table are listed in the draft-ietf-sipping-service-examples.txt specification.
The table covers most features offered in what are considered IP Centrex offerings from local exchange carriers and PBX (Private Branch Exchange) features. The table also includes services involving some extensions to SIP, including the REFER, SUBSCRIBE, and NOTIFY methods and the Replaces and Join headers.
Table 1-1 SBC Compliance and Support of SIP Services and Features
|
|
Cisco Unified Border Element (SP Edition) Compliance or Support
|
Call Hold |
Supported. |
Consultation Hold |
Supported. |
Music on Hold |
Supported. |
Call Hold with Music on Hold |
Supported. |
Find-Me |
Passthrough only. SBC does not perform find-me function. |
Call Park |
Passthrough only. SBC does not perform call park function. |
Call Forking |
Supported. |
Caller-ID |
Passthrough only. SBC does not perform caller-ID function. |
Calling Name Delivery |
Passthrough only. SBC does not perform calling name delivery function. |
Click to Dial |
Partial (not supported with SBC between end user computer and phone). |
Message Waiting Indicator |
Passthrough, depending on SIP SUBSCRIBER/NOTIFY messages |
Call Forwarding - Busy |
Partial (not supported with SBC between proxy and callee). |
Call Forwarding - No Answer |
Partial (not supported with SBC between proxy and callee). |
Call Forwarding - Unconditional |
Supported. |
SIP Session Refreshment with re-INVITE |
|
SIP - Specific Event Notification |
Partial support (RFC 3265). |
Transfer - Unattended |
Supported. |
Transfer - Attended |
Supported. |
Transfer - Instant Messaging |
Supported. |
3-way Conference - Third Party is Added |
Not supported. |
3-way Conference - Third Party Joins |
Not supported. |
Single Line Extension |
Not supported. |
Call Management (Incoming Call Screening) |
Passthrough only. SBC does not perform Call Screening function. |
Call Management (Outgoing Call Screening) |
Passthrough only. SBC does not perform Call Screening function. |
Call Pickup |
Not supported. |
Automatic Redial |
Not supported. |
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