On Fri, 2006-04-28 at 12:00 +0200, Frank Shearar wrote:
> service_field = [ [protocol] *("+" rs)]
> protocol = ALPHA *31ALPHANUM
> rs = ALPHA *31ALPHANUM
> ; The protocol and rs fields are limited to 32
> ; characters and must start with an alphabetic.
>
> In other words, an optional protocol specification followed by 0 or
> more resolution services. Each resolution service is indicated by an
> initial '+' character.
Where do I discover what "protocol specification" means, and what its
valid values are? Ditto for "resolution service".
For instance, "SIP+D2U" is a valid service_field value (per RFC 3261, if
I did not make a mistake), but I've never seen an explanation of what
"D2U" as a "resolution service" means. (Although RFC 3263 does explain
that NAPTR records with "SIP+D2U" are to be used for contacting a SIP
server via UDP, but it gives no explanation of why that value has that
meaning.)
Dale
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