Hi All,
 
    I am implementing a SIP User Agent. And I would
    want to implement the following services in my
    SIP user agent:
 
    1. Call Transfer
    2. Call Forwarding (Call Forwarding on Busy, No Reply, Unconditional)
    3. Call Hold
    4. Call Waiting
 
    Please let me know the RFCs, drafts or extensions for implementing
    each of these services in SIP User Agents.
 
Thanks,
Harsha  
 

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