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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).
POTS IP SPC Hotline

POTS IP SPC Hotline

The semi-permanent connection (SPC) hotline exclusively occupies a constant voice channel to meet the communication requirements and ensure the communication quality for special and key access users. To configure an IP SPC hotline, set up an IP direct connection between the two ends of the voice service. In this manner, the voice media data can be directly transmitted to the peer end. This is mainly used in the situation where two phones are online permanently without dialing. This scenario may be applied to some special dispatching phones.

Networking Description

Figure 1-102 shows the networking of a POTS IP SPC hotline. An IP SPC hotline is set up between the POTS port on AG_1 and POTS port on AG_2. Users under these two POTS ports are permanently online and can communicate with each other without dialing a number. The voice signals on POTS lines are carried through RTP streams when transmitted over the IP network. The call signaling on POTS lines, such as offhook and onhook signaling, is carried through RFC2833 packets.
Figure 1-102 Networking of a POTS IP SPC hotline

Call Setup and Release Flow for POTS IP SPC Hotline Service

Figure 1-103 shows the call setup and release flow for POTS IP SPC hotline service.
Figure 1-103 Call setup and release flow for POTS IP SPC hotline service
Call setup and release flow for POTS IP SPC hotline service is as following: ( User A is the caller and user B is the callee.)
  1. User A picks up the phone.
  2. AG_1 detects the offhook signal of user A and sends the offhook signal through an RFC2833 packet to AG_2. AG_2 sends an offhook acknowledgement message to AG_1 through RFC2833, and at the same time plays the ringing tone to user B. After receiving the offhook acknowledgement message, AG_1 transmits the ringback tone to user A.
  3. User B picks up the phone.
  4. AG_2 detects the offhook signal of user B and sends the offhook signal through an RFC2833 packet to AG_1 and stops the ringing tone to user B. AG_1 sends an offhook acknowledgement message to AG_2 through RFC2833, and at the same time stops the ringback tone to user A.
  5. The call is established between user A and user B.
  6. User A hangs up the phone.
  7. AG_1 detects the onhook signal of user A and sends the onhook signal through an RFC2833 packet to AG_2. AG_2 sends an onhook acknowledgement message to AG_1 through RFC2833, and at the same time plays the busy tone to user B.
  8. User B hangs up the phone.
  9. AG_2 detects the onhook signal of user B and sends the onhook signal through an RFC2833 packet to AG_1 and then stops the busy tone to user B. AG_1 sends an onhook acknowledgement message to MSAN_2 through RFC2833. The call is released.
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Updated: 2019-02-22

Document ID: EDOC1100067358

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