[Sip] Questions on Max-Forwards

[Loh Kok Jeng <kokjeng.loh@siemens.com>]

Dear all,

If a valid SIP message with "Max-Forwards: 1" is received by a proxy, should

the proxy decrement Max-Forwards and forward it, or should it respond with
483?

Likewise, how should the proxy handle a message with with Max-Forwards: 0 
or a negative value?

regards,
KJ Loh
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