--- configs/sip.conf.sample.2011-02-24	2011-02-24 10:28:58.000000000 -0700
+++ configs/sip.conf.sample	2011-02-24 10:36:06.000000000 -0700
@@ -215,7 +215,9 @@
 ;pedantic=yes                   ; Enable checking of tags in headers,
                                 ; international character conversions in URIs
                                 ; and multiline formatted headers for strict
-                                ; SIP compatibility (defaults to "yes")
+                                ; SIP compatibility (defaults to "yes" - new in 1.8, was "no" in 1.6)
+                                ; But if Asterisk silently ignores a REGISTER attempt from a phone,
+                                ; then set this to "no" (eg. Spectralink)
 
 ; See qos.tex or Quality of Service section of asterisk.pdf for a description of these parameters.
 ;tos_sip=cs3                    ; Sets TOS for SIP packets.