. WIKIMERIONET
Merion Mertics , ,

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CRM

4

SIP, VoIP PSTN Public Switched Telephone Network (), -7.

IP - , VoIP , -7, ISDN - Integrated Services Digital Network ( ), , ().

, , ISUP ISDN User Part. ISUP . ISUP .

ISUP , . . , , ISUP.

  1. IAM (Initial Address Message) - . . : , (, ).
  2. ACM (Address Complete Message) - . , . , ( )
  3. ANM (Answer Message) - , . .
  4. REL (Release) - , ( ).
  5. RLC (Release complete) - . , , .

, VoIP , -7, ISUP IP. ITU-T IETF SIP - SIP- I (Internetworking) SIP T (Telephony)( RFC 3372) .

, :

  1. ISUP
  2. SIP ISUP
  3. .

ISUP SIP, ISUP SIP.

, . . , A - , , B IP Phone, SIP. ISUP SIP IMG (Integrated Media Gateway)

SIP  PSTN

A, IAM, , , IMG IAM ISUP, INVITE SIP.

SIP ISUP.

, ISUP , IAM CIC (Circuit Identification Code).

, SIP , .


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