[Sip] SIP backward compatibility issue

[Prakash R <rprakash@cdotb.ernet.in>]

1) Assuming we have an application built using SIP stack developed to 
comply with RFC 3261, does it have to interwork with RFC 2543 compliant 
stack? If not RFC2543, then what about the various drafts (draft 5, 
draft 6, ..., draft 9)?

2) I was also wondering about the theoretical possibility of backward 
compatibility? Any provisions in the protocol for an implementation to 
detect and manage this issue?

3) Is it feasible for applications to have dual SIP Stacks? (Both 2543 
and 3261)?

4) Does it make sense now to still deal with 2543?

Thanks in advance.

Regards,
--
Prakash R
Senior Program Manager, Internet Telephony Group
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email: rprakash@cdotb.ernet.in, prakash_r@hotmail.com
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