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Voice Feature Guide 01

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Call Flow of SIP R2

Call Flow of SIP R2

R2 call flow manages the call connection between the AG and R2 terminals, and between the AG and IMS, which implements R2 terminal connection to the IMS network. Figure 1-114 shows the call flow.

Figure 1-114 Call flow of SIP R2

Basic R2 call flow:
  1. PBX1 sends the Seize event to AG1, and AG1 responds with Seize Ack and starts R2 digit collecting.
  2. AG1 sends the Invite message after collecting all digits and matches the digitmap.
  3. After receiving the Invite message, the IMS responds with 100 Trying and forwards Invite to AG2.
  4. After receiving Invite, AG2 responds with 100 Trying, finds out PBX2 according to the called number, and sends Seize to PBX2.
  5. PBX2 responds with Seize Ack and AG2 sends the converted called number to PBX2.
  6. PBX2 finds out the callee according to the received called number and responds to AG2 with B signaling and marks callee.
  7. AG2 sends response 180.
  8. The IMS forwards response 180 to AG1.
  9. AG1 responds with B signaling to PBX1.
  10. The user under PBX2 picks up the phone and PBX2 sends message Answer to AG2.
  11. AG2 sends response 200 to the IMS.
  12. The IMS forwards response 200 to AG1.
  13. AG1 sends message Answer to PBX1 and responds with Ack to the IMS for communication.
  14. The user under PBX1 hangs up the phone and PBX1 forwards message Clear Forward to AG1.
  15. AG1 sends message Bye to the IMS.
  16. The IMS forwards message Bye to AG2.
  17. AG2 responds with message 200 to the IMS and sends message Clear Forward to PBX2. Then, PBX2 responds with Clear Backward to AG2 and AG2 sends Release Guard to PBX2. The outgoing call is terminated.
  18. The IMS forwards response 200 to AG1.
  19. AG1 sends Clear Backward to PBX1. After AG1 receives Release Guard sent by PBX1, the incoming call is terminated.
  • The device supports the R2 service connected by E1 lines and G.SHDSL access.
  • The R2 service supports only basic calls.
  • Dialing modes MFC and DTMF are supported.
Updated: 2019-02-22

Document ID: EDOC1100067358

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