Polycom 1500/1800/2000/4000 manual Is longer than the server is willing to interpret

Appendix A - Disconnection Causes

Call Disconnection Causes

Disconnection Cause	Description
SIP client error 413	The endpoint sent a SIP Client Error 413 (Request Entity Too Large)
	response.
	The server is refusing to process a request because the request entity
	is larger than the server is willing or able to process.
SIP client error 414	The endpoint sent a SIP Client Error 414 (Request-URI Too Long)
	response.
	The server is refusing to service the request because the Request-URI
	is longer than the server is willing to interpret.
SIP client error 420	The endpoint sent a SIP Client Error 420 (Bad Extension) response.
	The server did not understand the protocol extension specified in a
	Require header field.
SIP client error 481	The endpoint sent a SIP Client Error 481 (Call/Transaction Does Not
	Exist) response.
SIP client error 482	The endpoint sent a SIP Client Error 482 (Loop Detected) response.
SIP client error 483	The endpoint sent a SIP Client Error 483 (Too Many Hops) response.
SIP client error 484	The endpoint sent a SIP Client Error 484 (Address Incomplete)
	response.
	The server received a request with a To address or Request-URI that
	was incomplete.
SIP client error 485	The endpoint sent a SIP Client Error 485 (Ambiguous) response.
	The address provided in the request (Request-URI) was ambiguous.
SIP client error 488	The endpoint sent a SIP Client Error 488 (Not Acceptable Here)
	response.
SIP forbidden	The SIP server rejected the request.
	The server understood the request, but is refusing to fulfill it.
SIP global failure 603	A SIP Global Failure 603 (Decline) response was returned.
	The participant's endpoint was successfully contacted, but the
	participant explicitly does not wish to or cannot participate.
SIP global failure 604	A SIP Global Failure 604 (Does Not Exist Anywhere) response was
	returned.
	The server has authoritative information that the user indicated in the
	Request-URI does not exist anywhere.
SIP global failure 606	A SIP Global Failure 606 (Not Acceptable) response was returned.
SIP gone	The requested resource is no longer available at the Server and no
	forwarding address is known.
SIP moved permanently	The endpoint moved permanently. The user can no longer be found at
	the address in the Request-URI.
SIP moved temporarily	The remote endpoint moved temporarily.
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