Hi,

I have been unable to pinpoint a recommendation relating to sizes of fields
within the SIP header. The issue relates to how much memory to allocate for
each field as a packet is built up.

Section 7.3 of RFC 3261 describes header field formats, but does not discuss
length limitations for those fields. Beyond the limitation of the overall
packet length, does anyone have a recommendation for how to size the header
fields? In other words, is it safe to restrict a Route to 128 bytes, for
example? Is there a list of such safe lengths for each header field? 

If not, what do implementations generally support? Do they generally allow
arbitrary lengths of the individual header fields, as long as the total
packet length falls within the allowed maximum?

Thanks in advance,

Hume

Hume Vance
Director, Firmware Engineering
Zoom Technologies, Inc.
207 South Street
Boston, MA 02111
USA
[EMAIL PROTECTED]
+1 617 753-0032

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