Media Gateway Control Media Gateway Control and the Softswitch - - PowerPoint PPT Presentation

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Media Gateway Control Media Gateway Control and the Softswitch - - PowerPoint PPT Presentation

Oct 09, 2022 17 likes •270 views

Media Gateway Control Media Gateway Control and the Softswitch Softswitch and the Architecture Architecture Call Flow for RGW to TGW (1/18) Call Flow for RGW to TGW (1/18) CA@ca.whatever.net 140.113.65.24 DB CA ACC SG rgw.whatever.net

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SLIDE 1

Media Gateway Control Media Gateway Control and the and the Softswitch Softswitch Architecture Architecture

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SLIDE 2

2 IP Telephony

Call Flow for RGW to TGW Call Flow for RGW to TGW (1/18)

(1/18) CA RGW TGW CO Internet PSTN

A calls B A calls B

A: 5712826 B: 5721043 hrd3/15 card6/5

rgw.whatever.net 140.113.214.123 tgw.whatever.net 140.113.65.24

SG

CA@ca.whatever.net 140.113.65.24

DB ACC

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SLIDE 3

3 IP Telephony

Call Flow for RGW to TGW Call Flow for RGW to TGW (2/18)

(2/18) CA RGW TGW CO Internet PSTN

A calls B A calls B

A: 5712826 B: 5721043 hrd3 card6/5

rgw.whatever.net 140.113.214.123 tgw.whatever.net 140.113.65.24

SG

1

CA@ca.whatever.net 140.113.65.24

DB ACC

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SLIDE 4

4 IP Telephony

RQNT(1) : NotificationRequest

RQNT 1201 *@rgw.whatever.net MGCP 1.0 N: CA@ca.whatever.net:5678 X: 0123456789AC R: hd(E(R(hu(N)),S(dl),D/(D))) D: (11x|080xxxxxx|57xxxxx|002x.T)

ACK to RQNT(1)

200 1201 OK

N: NotifyEntity X: RequestIdentifier R: RequestEvents D: DigitMap N: NotifyEntity X: RequestIdentifier R: RequestEvents D: DigitMap E: Embedded (enable) Request R: Notification Request S: Signal Request N: Notify immediately (default) D: Accumulate according to DigitMap Clear current dialed string E: Embedded (enable) Request R: Notification Request S: Signal Request N: Notify immediately (default) D: Accumulate according to DigitMap Clear current dialed string

Call Flow for RGW to TGW Call Flow for RGW to TGW (3/18)

(3/18)

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SLIDE 5

5 IP Telephony

Call Flow for RGW to TGW Call Flow for RGW to TGW (4/18)

(4/18) CA RGW TGW CO Internet PSTN

A calls B A calls B

A: 5712826 B: 5721043 hrd3 card6/5

rgw.whatever.net 140.113.214.123 tgw.whatever.net 140.113.65.24

SG

2 Off-hook Dial 5721043

CA@ca.whatever.net 140.113.65.24

DB ACC

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SLIDE 6

6 IP Telephony

NTFY(2) : Notify from RGW

NTFY 2002 hrd3@rgw.whatever.net MGCP 1.0 N: CA@ca.whatever.net:5678 X: 0123456789AC O: 5721043

ACK to NTFY(2)

200 2002 OK

N: NotifyEntity X: RequestIdentifier O: ObservedEvent Reported in the detected order N: NotifyEntity X: RequestIdentifier O: ObservedEvent Reported in the detected order

Call Flow for RGW to TGW Call Flow for RGW to TGW (5/18)

(5/18)

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SLIDE 7

7 IP Telephony

Call Flow for RGW to TGW Call Flow for RGW to TGW (6/18)

(6/18) CA RGW TGW CO Internet PSTN

A calls B A calls B

A: 5712826 B: 5721043 hrd3 card6/5

rgw.whatever.net 140.113.214.123 tgw.whatever.net 140.113.65.24

SG

3

CA@ca.whatever.net 140.113.65.24

DB ACC

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SLIDE 8

8 IP Telephony

CRCX(3) : CreateConnection

CRCX 1204 hrd3@rgw.whatever.net MGCP 1.0 C: A3C47F21456789F0 L: p:10, a: G.711; G.726-32 M: recvonly X: 0123456789AD R: hu

ACK to CRCX(3)

200 1204 OK I: FDE234C8 Session Description

C: CallId L: LocalCXOptions p: packetize period(ms) a: Compression Algo. M: Mode X: RequestIdentifier R: RequestEvents I: ConnectionId C: CallId L: LocalCXOptions p: packetize period(ms) a: Compression Algo. M: Mode X: RequestIdentifier R: RequestEvents I: ConnectionId

Call Flow for RGW to TGW Call Flow for RGW to TGW (7/18)

(7/18)

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SLIDE 9

9 IP Telephony

Session Description - ACK to CRCX(3)

Convey info about media streams Use textual format, case sensitive

v=0 c=IN IP4 140.96.102.166 m=audio 3456 RTP/AVP 0 96 a=rtpmap:96 G726-32/8000

V=<protocol version> C=<nw-type> <addr-type> <conn-type> M=<media> <port> <transport> (A=<attribute> (:<value>)) V=<protocol version> C=<nw-type> <addr-type> <conn-type> M=<media> <port> <transport> (A=<attribute> (:<value>))

Call Flow for RGW to TGW Call Flow for RGW to TGW (8/18)

(8/18)

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SLIDE 10

10 IP Telephony

Call Flow for RGW to TGW Call Flow for RGW to TGW (9/18)

(9/18) CA RGW TGW CO Internet PSTN

A calls B A calls B

A: 5712826 B: 5721043 hrd3 card6/5

rgw.whatever.net 140.113.214.123 tgw.whatever.net 140.113.65.24 CA@ca.whatever.net 140.113.65.24

SG

4

DB ACC

Query E.164

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SLIDE 11

11 IP Telephony

CRCX(4) : CreateConnection

CRCX 1205 card6/5@tgw.whatever.net MGCP 1.0 C: A3C47F21456789F0 L: p:10, a: G.711; G.726-32 M: sendrecv Session Description from ACK(3)

ACK to CRCX(4)

200 1205 OK I: 32F345E2 Session Description

C: CallId M: Mode I: ConnectionId C: CallId M: Mode I: ConnectionId

Call Flow for RGW to TGW Call Flow for RGW to TGW (10/18)

(10/18)

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SLIDE 12

12 IP Telephony

Call Flow for RGW to TGW Call Flow for RGW to TGW (11/18)

(11/18) CA RGW TGW CO Internet PSTN

A calls B A calls B

A: 5712826 B: 5721043 hrd3 card6/5

rgw.whatever.net 140.113.214.123 tgw.whatever.net 140.113.65.24

SG

4 5 ISUP IAM

CA@ca.whatever.net 140.113.65.24

DB ACC

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SLIDE 13

13 IP Telephony

MDCX(5) : ModifyConnection

MDCX 1206 hrd3@rgw.whatever.net MGCP 1.0 C: A3C47F21456789F0 I: FDE234C8 M: recvonly Session Description from ACK(4)

ACK to MDCX(5)

200 1206 OK

C: CallId I: ConnectionId M: Mode C: CallId I: ConnectionId M: Mode

Call Flow for RGW to TGW Call Flow for RGW to TGW (12/18)

(12/18)

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SLIDE 14

14 IP Telephony

CA RGW TGW CO Internet PSTN

A calls B A calls B

A: 5712826 B: 5721043 hrd3 card6/5

rgw.whatever.net 140.113.214.123 tgw.whatever.net 140.113.65.24

SG

4 6 ISUP ACM

CA@ca.whatever.net 140.113.65.24

DB ACC

Call Flow for RGW to TGW Call Flow for RGW to TGW (13/18)

(13/18)

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SLIDE 15

15 IP Telephony

RQNT(6) : NotificationRequest

RQNT 1207 hrd3@rgw.whatever.net MGCP 1.0 N: CA@ca.whatever.net:5678 X: 012345789AE R: hu S: v (alerting)

ACK to RQNT(6)

200 1207 OK

N: NotifyEntity X: RequestIdentifier R: RequestEvents S: SignalRequests N: NotifyEntity X: RequestIdentifier R: RequestEvents S: SignalRequests

Call Flow for RGW to TGW Call Flow for RGW to TGW (14/18)

(14/18)

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SLIDE 16

16 IP Telephony

CA RGW TGW CO Internet PSTN

A calls B A calls B

A: 5712826 B: 5721043 hrd3 card6/5

rgw.whatever.net 140.113.214.123 tgw.whatever.net 140.113.65.24

SG

4 7 ISUP ANM

CA@ca.whatever.net 140.113.65.24

DB ACC

Call Flow for RGW to TGW Call Flow for RGW to TGW (15/18)

(15/18)

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SLIDE 17

17 IP Telephony

MDCX(7) : ModifyConnection

MDCX 1209 hrd3@rgw.whatever.net MGCP 1.0 C: A3C47F21456789F0 I: FDE234C8 M: sendrecv X: 012345789AF R: hu S: (to stop alerting)

ACK to MDCX(7)

200 1209 OK

C: CallId I: ConnectionId M: Mode S: SignalRequests C: CallId I: ConnectionId M: Mode S: SignalRequests

Call Flow for RGW to TGW Call Flow for RGW to TGW (16/18)

(16/18)

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SLIDE 18

18 IP Telephony

CA RGW TGW CO Internet PSTN

A calls B A calls B

A: 5712826 B: 5721043 hrd3 card6/5

rgw.whatever.net 140.113.214.123 tgw.whatever.net 140.113.65.24

SG

9 8 ISUP REL

CA@ca.whatever.net 140.113.65.24

DB ACC

Call Flow for RGW to TGW Call Flow for RGW to TGW (17/18)

(17/18)

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SLIDE 19

19 IP Telephony

DLCX(8) : DeleteConnection

DLCX 1210 hrd3@rgw.whatever.net MGCP 1.0 C: A3C47F21456789F0 I: FDE234C8

ACK to DLCX(8)

200 1210 OK P: PS=1245, OS=62345, PR=780, OR=45123, PL=10, JI=27, LA=48

C: CallId I: ConnectionId C: CallId I: ConnectionId

PS: Packets sent OS: Octets sent PR: Packets received OR: Octets received PL: Packets lost JI: Average Jitter (ms) LA: Average Latency (ms) PS: Packets sent OS: Octets sent PR: Packets received OR: Octets received PL: Packets lost JI: Average Jitter (ms) LA: Average Latency (ms)

Call Flow for RGW to TGW Call Flow for RGW to TGW (18/18)

(18/18)

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SLIDE 20

20 IP Telephony

Usage of Commands Usage of Commands (1/6)

(1/6)

NotificationRequest()

EndpointId, [NotifiedEntity,] [RequestedEvents,] RequestIdentifier, [DigitMap,] [SignalRequests,] [QuarantineHandling,] [DetectEvents,] [encapsulated EndpointConfiguration]

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SLIDE 21

21 IP Telephony

Usage of Commands Usage of Commands (2/6)

(2/6)

CreateConnection()

CallId, EndpointId, [NotifiedEntity,] [LocalConnectionOption,] Mode, [{RemoteConnectDescptr|SecondEndpointId}] [EncapsulatedNotificationRequest,] [Encapsulated EndpointConfiguration]

ReturnCode

ConnectionId, [SpecificEndPointId,] [SecondConnectionId,] [SecondEndPointId,] [LocalConnectionDescriptor]

Hairpin Connection Hairpin Connection Endpoint Endpoint

PSTN

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SLIDE 22

22 IP Telephony

RestartInProgress()

EndPointId RestartMethod [RestartDelay] [Reason-code]

ReturnCode

[NotifiedEntity]

RestartMethod

  • graceful (delay/null)
  • forced (null)
  • restart (delay in seconds)
  • disconnected (delay in seconds)

indicates EP disconnected & trying to reconnect it

  • cancel-graceful

RestartMethod

  • graceful (delay/null)
  • forced (null)
  • restart (delay in seconds)
  • disconnected (delay in seconds)

indicates EP disconnected & trying to reconnect it

  • cancel-graceful

Usage of Commands Usage of Commands (4/6)

(4/6)

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SLIDE 23

23 IP Telephony

AuditEndPoint()

EndpointId [RequestedInfo]

ReturnCode

  • EndPointIdList |
  • {RequestedEvents
  • DigitMap
  • SignalRequests
  • RequestIdentifier … }

If EndpointId is “all of wildcard”, EndPointIdList is returned

Usage of Commands Usage of Commands (5/6)

(5/6)

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SLIDE 24

24 IP Telephony

AuditConnection()

EndpointId ConnectionId RequestedInfo

ReturnCode

depend on RequestedInfo

CallId NotifiedEntity LocalConnectionOptions …

“Wildcard” shall not be used

Usage of Commands Usage of Commands (6/6)

(6/6)

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SLIDE 25

25 IP Telephony

Transmitted via UDP

default MGCP port for GW: 2427 default MGCP port for CA: 2727

Reliable Transmission

keeping recent list of transactions retransmission algorithm

Piggy-backing

multiple MGCP messages in one UDP packet

200 2005 OK DLCX 1244 card23/21@tgw.example.net MGCP 1.0 C: …

Transmission Transmission