RFC 3666's Call Flows
-- SIP to PSTN Dialing

is an Internet BCP (Best Current Practice) that contains examples of SIP call flows showing interworking with the Public Switched Telephone Network (PSTN). Scenarios include SIP to PSTN, PSTN to SIP, and PSTN to PSTN via SIP.
SIP messages are reported in strict conformance with this RFC.

Note: PDF documents have been registered with the option "Fit in Window" and should be viewed as such.
 

Next

	3666-2.1	Successful SIP to ISUP PSTN call
	3666-2.2	Successful SIP to ISDN PBX call
	3666-2.3	Successful SIP to ISUP PSTN call with overflow
	3666-2.4	Successful SIP to SIP using ENUM Query

	3666-2.5	Unsuccessful SIP to PSTN call: Treatment from PSTN
	3666-2.6	Unsuccessful SIP to PSTN: REL w/Cause from PSTN
	3666-2.7	Unsuccessful SIP to PSTN: ANM Timeout

RFC3666-2.1 -- Successful SIP to ISUP PSTN call

  -- 29 April 2005, v1.1

Next

	3666-2.1	Successful SIP to ISUP PSTN call
	3666-2.2	Successful SIP to ISDN PBX call
	3666-2.3	Successful SIP to ISUP PSTN call with overflow
	3666-2.4	Successful SIP to SIP using ENUM Query

	3666-2.5	Unsuccessful SIP to PSTN call: Treatment from PSTN
	3666-2.6	Unsuccessful SIP to PSTN: REL w/Cause from PSTN
	3666-2.7	Unsuccessful SIP to PSTN: ANM Timeout

RFC3666-2.2 -- Successful SIP to ISDN PBX call

  -- 29 April 2005, v1.1

Next

	3666-2.1	Successful SIP to ISUP PSTN call
	3666-2.2	Successful SIP to ISDN PBX call
	3666-2.3	Successful SIP to ISUP PSTN call with overflow
	3666-2.4	Successful SIP to SIP using ENUM Query

	3666-2.5	Unsuccessful SIP to PSTN call: Treatment from PSTN
	3666-2.6	Unsuccessful SIP to PSTN: REL w/Cause from PSTN
	3666-2.7	Unsuccessful SIP to PSTN: ANM Timeout

RFC3666-2.3 -- Successful SIP to ISUP PSTN call with overflow

  -- 29 April 2005, v1.1

Next

	3666-2.1	Successful SIP to ISUP PSTN call
	3666-2.2	Successful SIP to ISDN PBX call
	3666-2.3	Successful SIP to ISUP PSTN call with overflow
	3666-2.4	Successful SIP to SIP using ENUM Query

	3666-2.5	Unsuccessful SIP to PSTN call: Treatment from PSTN
	3666-2.6	Unsuccessful SIP to PSTN: REL w/Cause from PSTN
	3666-2.7	Unsuccessful SIP to PSTN: ANM Timeout

RFC3666-2.4 -- Successful SIP to SIP using ENUM Query

  -- 29 April 2005, v1.1

Next

	3666-2.1	Successful SIP to ISUP PSTN call
	3666-2.2	Successful SIP to ISDN PBX call
	3666-2.3	Successful SIP to ISUP PSTN call with overflow
	3666-2.4	Successful SIP to SIP using ENUM Query

	3666-2.5	Unsuccessful SIP to PSTN call: Treatment from PSTN
	3666-2.6	Unsuccessful SIP to PSTN: REL w/Cause from PSTN
	3666-2.7	Unsuccessful SIP to PSTN: ANM Timeout

RFC3666-2.5 -- Unsuccessful SIP to PSTN call: Treatment from PSTN

  -- 29 April 2005, v1.1

Next

	3666-2.1	Successful SIP to ISUP PSTN call
	3666-2.2	Successful SIP to ISDN PBX call
	3666-2.3	Successful SIP to ISUP PSTN call with overflow
	3666-2.4	Successful SIP to SIP using ENUM Query

	3666-2.5	Unsuccessful SIP to PSTN call: Treatment from PSTN
	3666-2.6	Unsuccessful SIP to PSTN: REL w/Cause from PSTN
	3666-2.7	Unsuccessful SIP to PSTN: ANM Timeout

RFC3666-2.6 -- Unsuccessful SIP to PSTN: REL w/Cause from PSTN

  -- 29 April 2005, v1.1

Next

	3666-2.1	Successful SIP to ISUP PSTN call
	3666-2.2	Successful SIP to ISDN PBX call
	3666-2.3	Successful SIP to ISUP PSTN call with overflow
	3666-2.4	Successful SIP to SIP using ENUM Query

	3666-2.5	Unsuccessful SIP to PSTN call: Treatment from PSTN
	3666-2.6	Unsuccessful SIP to PSTN: REL w/Cause from PSTN
	3666-2.7	Unsuccessful SIP to PSTN: ANM Timeout

RFC3666-2.7 -- Unsuccessful SIP to PSTN: ANM Timeout

  -- 29 April 2005, v1.1