The adjoining diagram shows a SIP to SS7 (sip to isup) call. In the middle is a class-4 tandem switch which is connected with originating network switch on SIP and with terminating network switch on SS7.
INVITE: SIP Client to Soft Switch
INVITE sip:[email protected]:2500 SIP/2.0 Via: SIP/2.0/UDP 10.108.60.155:2500;branch=z9hG4bK-24937-1-0 From: "9876543210" <sip:[email protected]:2500>;tag=249379876543210Tag001 To: sut <sip:[email protected]:2500> Call-ID: [email protected] CSeq: 1 INVITE Contact: sip:[email protected]:2500 P-Asserted-Identity: <tel:9045470697> Max-Forwards: 70 Subject: Performance Test Content-Type: application/sdp Content-Length: 137 v=0 o=user1 53655765 2353687637 IN IP4 10.108.60.155 s=- c=IN IP4 10.108.60.155 t=0 0 m=audio 6004 RTP/AVP 0 a=rtpmap:0 PCMU/8000
100 Trying: Soft Switch to SIP Client
SIP/2.0 100 Trying Call-ID: [email protected] From: "9876543210" <sip:[email protected]:2500>;tag=249379876543210Tag001 To: sut <sip:[email protected]:2500>;tag=9299937628566867813 CSeq: 1 INVITE Via: SIP/2.0/UDP 10.108.60.155:2500;branch=z9hG4bK-24937-1-0;received=10.108.60.155 Supported: timer,100rel
IAM: Soft Switch to SSP
ISDN User Part CIC: 1 Message Type: Initial address (1) Nature of Connection Indicators : 0x0 Forward Call Indicators : 0x800 Calling Party's category : 0x0 (Category unknown at this time (national use)) Transmission medium requirement : 0 (speech) Called Party NumberCalled Party Number: 9012345678 Pointer to start of optional part: 9 Parameter: (t=10, l=7) Calling party number: Calling party numberCalling Party Number: 9045470697 End of optional parameters (0)
ACM: SSP to Soft Switch
ISDN User Part CIC: 1 Message Type: Address complete (6) Backward Call Indicators : 0x1604 No optional parameter present (Pointer: 0)
CRCX: MGC to Media Gateway
Media Gateway Control Protocol CRCX (CreateConnection) Transaction ID: 1380022 Endpoint: S1/E1-3/[email protected] Version: MGCP 1.0 Parameters CallId (C): 000000025fc4e0ee8110000400044f65 LocalConnectionOptions (L): L: e:on,s:off ConnectionMode (M): sendrecv RequestIdentifier (X): 637651 RequestedEvents (R): x-fax/start, x-fax/end, x-vbd/start, x-vbd/end, x-vbd/nopvbd Session Description Protocol Session Description Protocol Version (v): 0 Owner/Creator, Session Id (o): user1 53655765 2353687637 IN IP4 10.108.60.155 Session Name (s): - Connection Information (c): IN IP4 10.108.60.155 Time Description, active time (t): 0 0 Media Description, name and address (m): audio 6004 RTP/AVP 0 Media Attribute (a): rtpmap:0 PCMU/8000 Data: 0a
CRCX Ack: Media Gateway to MGC
Media Gateway Control Protocol Response Code: The requested transaction was executed normally. (200) Transaction ID: 1380019 Response String: Connection was modified!! Session Description Protocol Session Description Protocol Version (v): 0 Owner/Creator, Session Id (o): MG4000|2.0 3922 7843 IN IP4 10.108.60.49 Session Name (s): - Connection Information (c): IN IP4 10.108.60.49 Time Description, active time (t): 0 0 Media Description, name and address (m): audio 53552 RTP/AVP 0 Media Attribute (a): ptime:20 Media Attribute (a): X-vrzcap:vbd Ver=0 Mode=FaxPr ModemRtpRed=0 Media Attribute (a): X-vrzcap:identification bin=CMG1169 Prot=mgcp App=MG
18x : MGC to SIP Client
SIP/2.0 180 Ringing Call-ID: [email protected] From: "9876543210" <sip:[email protected]:2500>;tag=249379876543210Tag001 To: sut <sip:[email protected]:2500>;tag=9299937628566867813 CSeq: 1 INVITE Via: SIP/2.0/UDP 10.108.60.155:2500;branch=z9hG4bK-24937-1-0;received=10.108.60.155 Contact: <sip:[email protected]:2500;user=phone> Allow: INVITE,CANCEL,BYE,ACK,REFER Supported: timer,100rel
ANM : SSP to MGC
ISDN User Part CIC: 1 Message Type: Answer (9) Pointer to start of optional part: 1 Parameter: (t=17, l=2) Backward call indicators: Backward call indicators : 0x1604 Parameter: (t=33, l=7) Connected number: Connected numberConnected Number: 9012345678 End of optional parameters (0)
200 OK : MGC to SIP Client
SIP/2.0 200 OK Call-ID: [email protected] From: "9876543210" <sip:[email protected]:2500>;tag=249379876543210Tag001 To: sut <sip:[email protected]:2500>;tag=9299937628566867813 Content-Type: application/sdp Session-Expires: 3600;refresher=uas CSeq: 1 INVITE Via: SIP/2.0/UDP 10.108.60.155:2500;branch=z9hG4bK-24937-1-0;received=10.108.60.155 Contact: <sip:[email protected]:2500;user=phone> Allow: INVITE,CANCEL,BYE,ACK,REFER Supported: timer,100rel v=0 o=MG4000|2.0 3922 3922 IN IP4 10.108.60.49 s=- c=IN IP4 10.108.60.49 t=0 0 m=audio 53556 RTP/AVP 0 a=ptime:20
ACK : SIP Client to MGC
ACK sip:[email protected]:2500 SIP/2.0 Via: SIP/2.0/UDP 10.108.60.155:2500;branch=z9hG4bK-24937-1-5 From: 9876543210 <sip:[email protected]:2500>;tag=249379876543210Tag001 To: sut <sip:[email protected]:2500>;tag=9299937628566867813 Call-ID: [email protected] CSeq: 1 ACK Contact: sip:[email protected]:2500 Max-Forwards: 70 Subject: Performance Test Content-Length: 0
REL : SSP to MGC
ISDN User Part CIC: 1 Message Type: Release (12) Cause indicators No optional parameter present (Pointer: 0)
DLCX : MGC to Media Gateway
Media Gateway Control Protocol DLCX (DeleteConnection) Transaction ID: 1380026 Endpoint: S1/E1-3/[email protected] Version: MGCP 1.0 Parameters CallId (C): 000000025fc4e0ee8110000400044f65 ConnectionIdentifier (I): 3921 RequestIdentifier (X): 637654 RequestedEvents (R):
DLCX Ack : Media Gateway to MGC
Media Gateway Control Protocol Response Code: The connection was deleted. (250) Transaction ID: 1380026 Response String: Connection was deleted!! Parameters ConnectionParameters (P): P:OS=24160,PS=151,PR=0,OR=0,PL=0,JI=0,LA=0
RLC : MGC to SSP
ISDN User Part CIC: 1 Message Type: Release complete (16) No optional parameter present (Pointer: 0)
BYE : MGC to SIP Client
BYE sip:10.108.60.155:2500;transport=UDP SIP/2.0 Via: SIP/2.0/UDP 10.108.60.128:2500;branch=z9hG4bK-6110040000044f67-a6c3c80-2 Call-ID: [email protected] To: "9876543210" <sip:[email protected]:2500>;tag=249379876543210Tag001 From: sut <sip:[email protected]:2500>;tag=9299937628566867813 CSeq: 2 BYE Supported: timer,100rel Max-Forwards: 70 User-Agent: VCS 5.11.2.13-019
200 OK : SIP Client to MGC
SIP/2.0 200 OK Via: SIP/2.0/UDP 10.108.60.128:2500;branch=z9hG4bK-6110040000044f67-a6c3c80-2 To: "9876543210" <sip:[email protected]:2500>;tag=249379876543210Tag001 From: sut <sip:[email protected]:2500>;tag=9299937628566867813 Call-ID: [email protected] CSeq: 2 BYE Contact: <sip:10.108.60.155:2500;transport=UDP> Content-Length: 0