[Sip] Query about Supported and require header in Invite

["Sudhir Kumar Reddy" <t.sudhirkumar at gmail.com>]

Hi All,

Can supported header contains like timer or any other option tag without (RFC3262Tag)100rel and can require header contain rfc3262tag(100rel)?

Is that mandatory INVITE request should contain supported and require header with 100rel option tag?

Eg: Supported: Timer
    Require: 100rel
The above example is ok to be in INVITE request

Any response is highly appreciated.

Thanks,
Sudhir
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