change SIP_MAX_PACKET to 4096 (bug #2623)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/v1-0@3980 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -129,7 +129,9 @@ static char *tdesc = "Session Initiation Protocol (SIP)";
 static char *config = "sip.conf";
 
 #define DEFAULT_SIP_PORT	5060	/* From RFC 2543 */
-#define SIP_MAX_PACKET	1500		/* Also from RFC 2543, should sub headers tho */
+/* From RFC2543, this should be 1500, so it's up to the ability of
+   remote devices as to whether it will be accepted when more than that*/
+#define SIP_MAX_PACKET		4096
 
 #define ALLOWED_METHODS "INVITE, ACK, CANCEL, OPTIONS, BYE, REFER"