How to configure the secondary dial tone on the U1981?

The problem may be caused by the following reasons: 1. The DSP DIMM module is not installed or not properly installed. 2. An audio license file is not installed on the system. For details, see the following URL: DSP无法正常工作

The DTMF second dial tone may not be detected because the G.729 codec mode is a lossy codec mode.

(Versions later than V200R002C00) The possible reasons are: -The local call prefix is not correctly configured. When you call a local phone number, the busy tone indicates the local call prefix is not configured or incompletely configured. Ensure that the following mandatory parameters of the call prefix are configured correctly: call-type, digit-length, and prefix. -The called party's number does not exist. You can run the display voice pbxuser or display current-configuration command to check the existence of the called user or configuration integrity. For a POTS user, mandatory pbxuser parameters port and telno must be set correctly. For a SIPUE user, mandatory pbxuser parameters sipue and telno must be set correctly. -The called party has configured the call restriction services. Run the display voice pbxuser or display current-configuration command to verify that the called party has configured the call restriction services such as call rejection and selective call acceptance. If the fault persists, contact Huawei technical support personnel. (V200R002C00 and earlier versions) The possible reasons are: -The local call prefix is not correctly configured. When you call a local phone number, the busy tone indicates the local call prefix is not configured or incompletely configured. Ensure that the following mandatory parameters of the call prefix are configured correctly: enterprise, dn-set, centrex, prefix, call-type, maximum-length, and minimum-length, and the enterprise, dn-set, and centrex are consistent with planned information about the calling and called parties. -The called party's number does not exist. Run the display voice dialno or display current-configuration command to verify that the called party exists and the mandatory parameters of dialno including pbxuser, port, and dn-set are configured. -The called party has configured the call restriction services. Run the display voice dialno or display current-configuration command to verify that the called party has configured the call restriction services such as call rejection and selective call acceptance. If the fault persists, contact Huawei technical support personnel.

For S series switches (except the S1700): In V100R006 and later versions, each interface of an S series fixed switch supports up to eight secondary IP addresses. In V100R003 and later versions, each interface of an S series modular switch supports up to 255 secondary IP addresses.

The method of configuring a number chart on IAD is as follows: Through the web interface to access the IAD, in the navigation bar to select the "SIP service configuration > SIP figure".