Asynchronous Features for IMS Applications
One of main advantages of using the SIP protocol for developing IMS applications is its asynchronous nature. Interactive applications are those ones providing asynchronous notifications of events, and nowadays the current trend is on this direction (just take a look around to the asynchronous Web where you have the ability for the application to deliver state changes to the client, without the user necessarily having to initiate those updates).
SIP is inherently an asynchronous protocol, where your User Agent or IMS entity is both client and server, and therefore, interactivity is a default feature. One of the main extensions offered by the SIP protocols is the SUBSCRIBE / NOTIFY mechanism RFC 3265.
SUBSCRIBE/NOTIFY is a kind of observer pattern, where clients subscribe (listen) to a server for specific events, and once the server decides that a certain event must be communicated to the client, it notifies them about it (using the contact information provided by the client during subscription).
OMA Presence architecture makes use of this framework to provide near realtime presence information about your contacts (buddy list): Presence services allow users to instantly see the availability of other users even before contacting them. Presence information includes e.g. on-line status, activity, mood, and location of a user.
Many kind of applications (RSS, news updates, gaming, stock market, media clips releases, sensor related, etc) can be developed straightforward without much effort.
A few weeks ago I started developing a small application called "EventI". It came from the necessity of keeping information about events (parties or concerts for instance) in my surrounding, and instead of keep on calling to my friends to know if they were comming and checking the website for new events, the applications notifies to me about new events and which of my friends are comming as well, everything following the subscription mechanism offered by RFC3265.
The big advantage of using SIP for this kind of multimedia services is that application developers concentrate on the business logic of the service as such instead of creating their own subscription/notification protocol. In addition, benefits offered by the IMS network, such us security/identity, service integration, multimedia capabilities among others are inherited by your service.
SIP is inherently an asynchronous protocol, where your User Agent or IMS entity is both client and server, and therefore, interactivity is a default feature. One of the main extensions offered by the SIP protocols is the SUBSCRIBE / NOTIFY mechanism RFC 3265.
SUBSCRIBE/NOTIFY is a kind of observer pattern, where clients subscribe (listen) to a server for specific events, and once the server decides that a certain event must be communicated to the client, it notifies them about it (using the contact information provided by the client during subscription).
OMA Presence architecture makes use of this framework to provide near realtime presence information about your contacts (buddy list): Presence services allow users to instantly see the availability of other users even before contacting them. Presence information includes e.g. on-line status, activity, mood, and location of a user.
Many kind of applications (RSS, news updates, gaming, stock market, media clips releases, sensor related, etc) can be developed straightforward without much effort.
A few weeks ago I started developing a small application called "EventI". It came from the necessity of keeping information about events (parties or concerts for instance) in my surrounding, and instead of keep on calling to my friends to know if they were comming and checking the website for new events, the applications notifies to me about new events and which of my friends are comming as well, everything following the subscription mechanism offered by RFC3265.
The big advantage of using SIP for this kind of multimedia services is that application developers concentrate on the business logic of the service as such instead of creating their own subscription/notification protocol. In addition, benefits offered by the IMS network, such us security/identity, service integration, multimedia capabilities among others are inherited by your service.
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