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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).
Principle of IP Z Interface Extension

Principle of IP Z Interface Extension

The typical IP Z interface extension service includes a Z interface, the IP transmission network, and a POTS port.

Figure 1-121 demonstrates the implementation principle of IP Z interface extension. In this network diagram, two access devices, MSANs, one located at the headquarters (HQ) and the other at the branch office, are interconnected through the IP network. Such a networking model eliminates the limitations on the line type and line transmission distance, and covers a wider range of users. MSAN_1 at the HQ converts the analog signals of the local exchange (PBX) into digital signals using the analog-to-digital conversion mechanism. The voice signals on POTS lines are carried through RTP packets when transmitted over the IP network. The call signaling on POTS lines, such as signaling for offhook, onhook, hookflash pressing, and ringing, is carried through RFC2833 packets. In this way, the voice signals and call signaling are transmitted using the IP network to the POTS port of the remote access device MSAN_2. MSAN_2 restores the analog signals from the digital signals using the digital-to-analog mechanism, thus extending POTS signals from the Z interface of MSAN_1 to the POTS port of MSAN_2.

The IP Z interface extension services enables user A and user B to have the same user experience when making outgoing and incoming calls. The Z interface of MSAN_1 and the POTS port of MSAN_2 are in one-to-one mapping and are configured on a 1:1 basis.

Figure 1-121 Principle of IP Z interface extension

Updated: 2019-02-22

Document ID: EDOC1100067358

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