RFC 3665, "Session Initiation Protocol (SIP) Basic Call Flow Examples", December 2003

Errata ID: 6242
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Johan Kuuse
Date Reported: 2020-07-27

Section 3.9 says:

SIP/2.0  486 Busy Here

It should say:

SIP/2.0 486 Busy Here

Notes:

At three different locations in section 3.9, there are two space characters between the SIP version and the Status Code, instead of one space.

According to RFC 3261, section 7.2, the Status line of a SIP Response, each element is separated by a single SP character.

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