ZyXEL ISG50-PSTN User Guide - Page 432
Table 141, Label, Description
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Chapter 27 Global PBX Settings See Section 13.2 on page 285 to set the WAN trunk the ISG50 uses for default traffic. Figure 278 Configuration > PBX > Global > SIP Server Each field is described in the following table. Table 141 Configuration > PBX > Global > SIP Server LABEL SIP Server Realm Name Port DESCRIPTION A realm is a set of usernames and passwords used by SIP client devices to authenticate with a SIP server. The ISG50 supports a single realm. When SIP clients register with the ISG50, they must provide the name of the realm they belong to as well as the username and password. Type the realm name which the extensions that register with the ISG50 must provide for authentication. Enter the ISG50's listening port number or keep the default value. This is the port number your SIP clients need to use to register with the ISG50. Default SIP Client Registration Expiration You can also enter up to two different alternate ports. The ISG50 is a SIP registrar server. A SIP registrar server maintains a database of SIP identity-to-IP address (or domain name) mapping. The ISG50 checks your username, password and realm when you register. Enter the number of seconds SIP clients are registered with the ISG50 before their registration record is deleted. Make sure that the client SIP devices are configured to re-register at an interval smaller than the time set in this field. RTP Port Range You can enter expiration times for SIP clients that use NAT as well as those that do not. When you make a VoIP call using SIP, the RTP (Real time Transport Protocol) is used to handle voice data transfer. Enter the listening port number(s) for RTP traffic or keep the default values. Enter the port number at the beginning of the range in the first field and enter the port number at the end of the range in the second field. Default Ring Time Specify for how many seconds the ISG50 sends a ringing tone to client devices for incoming calls. 432 ISG50 User's Guide
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