> Could you please provide us the boundary condition of
> these SIP headers (TO, FROM, VIA).
> Maximum length value allowed in these header.

RFC 3261 does not impose a maximum size upon headers.  However, section
18.1.1 does discuss the message size constraints associated with some
transports.  Additionally, some devices might want to impose some message
size limits to mitigate some forms of attack.

Concerning devices that attempt to impose header size constraints, the Via
header is one that occasionally causes interoperability issues until they
fix the device to accommodate larger headers.  For instance with a default
Max-Forwards of 70 and use of a globally unique Via branch, there can be
many large comma-separated Via header field values within a single Via
header.
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