[SIPForum-discussion] Allow Header usage

[Gopalakrishnan A.N]

Allow is mandatory.

On Mon, Aug 22, 2011 at 8:32 AM, vijay baskar <vijaybaskar.sm at gmail.com>wrote:

> Hi,
>
> Is the Allow header is mandatory in INVITE and 200 OK, after reading the
> RFC it looks like it is mandatory.
> But there are some UA still accepting the INVITE/200 OK without Allow
> header.
>
> Please clarify.
>
>
>
> From RFC 3261:
>
>  13.2.1 Creating the Initial INVITE
> *Since the initial INVITE represents a request outside of a dialog, its
> construction follows the procedures of **Section 8.1.1. Additional
> processing is required for the specific case of INVITE. An Allow header
> field (Section **20.5) SHOULD be present in the INVITE. It indicates what
> methods can be invoked within a dialog, on the UA **sending the INVITE,
> for the duration of the dialog. For example, a UA capable of receiving INFO
> requests within **a dialog [34] SHOULD include an Allow header field
> listing the INFO method. ** *
> * *
> 13.3.1.4 The INVITE is Accepted
>  *The UAS core generates a 2xx response. This response establishes a
> dialog, and therefore follows the **procedures of Section 12.1.1 in
> addition to those of Section 8.2.6. A 2xx response to an INVITE SHOULD **contain
> the Allow header field and the Supported header field, and MAY contain the
> Accept header field. ** *
>
>
> Thanks in advance.
>
> BRs
> Vijay
>
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-- 
Thank you  with regards,
Gopalakrishnan A.N.
VoIP call - sip:saigop at gtalk2voip.com
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