SIP SIMPLE Client SDK

h1. Payloads API

These applications provide functionality that are required for implementing a feature-rich SIP SIMPLE client. These applications are used for parsing and generating bodies carried using PUBLISH, SUBSCRIBE and NOTIFY methods designed for asynchronous event notifications, to convey in near real-time, information between SIP end-points.

An example of such information is presence, which in its basic form it provides user availability information based on end-user choice.  In its advanced form, presence can provide rich state information including but not limited to user mood, geo-location, environment, noise level and the type of communication desired.  The information can be disseminated based on a granular policy which allows end-users to decide who has access to which part of the published information.

h2. addressbook.py

High-level implementation of an addressbook stored in XCAP documents.  The

contacts, groups and their attributes are stored in resource lists and OMA

extensions described in OMA-TS-Presence_SIMPLE_XDM are used for describing

policy and RLS services by references to resource lists.  Multiple client

instances can synchronize this addressbook using XCAP-diff event package.

h2. watcherinfo.py 

Described in RFC3857 and RFC3858.

Parses NOTIFY body for presence.winfo event. Used for keeping track of

watchers that subscribed to our presentity.  Based on this information the

the user can manage its presence policy.  To retrieve this information the

SIP client must subscribe to its own address for event presence.winfo.

h2 resourcelists.py

Described in RFC4826.

Parses and generates XML documents for constructing resource lists

documents.  Used for server side storage of presence related buddy lists

using XCAP protocol.  The SIP clients maintain the resource-lists on the

XCAP server which provides persisten storage and aggregation point for

multiple devices.

rlsservices.py (RFC4826)

Parses and generates XML documents for constructing rls-services documents. 

Used for delegating presence related works to the server.  The client build

rls-services lists with buddies and instructs the server to subscribe to the

sip uris indicated in the lists.  This way the client can save bandwidth as

the server performs the signalling for subscription and collection of

notifications and provides consolidated answer to the sip user agent.

rlmi.py, rlsnotify.py (RFC4482)

Document handling for NOTIFY body for Resource Lists Contact Information.

policy.py (RFC4745)

Generic data types to be used in policy applications.

presrules.py (RFC5025)

Parses and generates authorization rules in XML format for presence or other

applications.  Authorization rules are stored on the XCAP server.  The

presence rules are generated either based on user initiative or as a

response to a new subscription signaled by a change in the watcherinfo

application.

omapolicy.py (OMA-TS-Presence_SIMPLE_XDM-V1_1)

Conditions extension handling according to OMA-TS-Presence_SIMPLE_XDM-V1_1. 

This module provides an extension to common policy defined in RFC4745 to

support condition extensions defined by OMA.

prescontent.py (OMA-TS-Presence_SIMPLE_XDM-V1_1)

Generates presence content application documents according to OMA TS

Presence SIMPLE Content.

directory.py (OMA Core Specifications)

Parses xcap-directory messages according to OMA TS XDM Core.

dialoginfo.py (RFC4235)

Parses and produces dialog-info messages according to RFC4235.

dialogrules.py

Parses and produces Dialog Authorization Rules documents. As there is no RFC

for this, common-policy format from RFC 4745 is used.  Subscription Handling

has been taken from RFC 5025.

pidf.py (RFC3863 and RFC3379)

This module provides classes to parse and generate PIDF documents, and also

uses the XML Application extensibility API to allow extensions to PIDF. It

is used to parse NOTIFY body for presence event and generates rich presence

state information for use with PUBLISH. Used to generate own presence

information and to parse the state of buddy lists entries we have subscribed

to. A SIP client typically instantiates a new pidf object for itself and for

each buddy it SUBSCRIBEs to and update each object when a NOTIFY is

received. The list of buddys is maintained using resourcelists application.

rpid.py (RFC4480)

This module provides an extension to PIDF to support rich presence.

presdm.py (RFC4479)

This module provides an extension to the PIDF to support the data module

defined in RFC4479.

cipid.py (RFC4482)

This module provides an extension to PIDF to provide person related information.

caps.py (RFC5196)

This module provides capabilities application: displays OPTIONS request-like information

as an extension to the PIDF.

xcapcaps.py (RFC4825)

Support for parsing and building xcap-caps documents, as defined by RFC4825.

xcapdiff.py (RFC5874)

Parses NOTIFY body for xcap-diff event. Used to detect changes in XCAP

documents changed by other device configured for the same presentity.

iscomposing.py (RFC3994)

This module parses and generates isComposing messages according to RFC3994. It's used

mainly in chat environments to indicate the other party that the user is actually

typing a message.

conference.py (RFC4575)

This module implements conference-info payload parsing and generating for

describing information about conference participants and related resources.

messagesummary.py (RFC3842)

This module implements a parser and generator for message-summary payload,

which is used to indicate missed calls or voice mail recordings.