Hi Varadhan,

As per RFC-3261, hostname should be like:

hostname         =  *( domainlabel "." ) toplabel [ "." ]
domainlabel      =  alphanum
                    / alphanum *( alphanum / "-" ) alphanum
toplabel         =  ALPHA / ALPHA *( alphanum / "-" ) alphanum

It means SIP Domain name should consists of labels which are delimited
by dots. In a practical environment, there should be the hostname in
this format otherwise it will be of no use and will be rejected by SIP
Server.

On Tue, Jan 3, 2017 at 1:08 AM, Varadhan Work <varadhan.w...@gmail.com> wrote:
> Hello,
>
> Is it legal to have SIP domain name in SIP packet with only one single part
> without top level domain name ?
>
> In general domain name syntax
>
> *A domain name consists of one or more parts, technically called labels,
> that are conventionally concatenated, and delimited by dots, such
> as example.com <https://en.wikipedia.org/wiki/Example.com>.*
> Which means, can it be specified with one part in SIP ?
>
> Thanks & Regards,
> Varadhan
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