Cisco Unified Border Element (SP Edition) Configuration Guide: Unified Model
Appendix B: SIP Compliance and Interoperability
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Table of Contents

SIP Compliance and Interoperability

SIP Features and SBC Compliance

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

SIP Service or Feature
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.