Which precautions shall be taken for the interworking between 1.7 and 1.6

Q: Which precautions shall be taken for the interworking between 1.7 and 1.6?

A: You need configure as follows in both new and old versions:
voip h323-descriptor Gateway
If this command cannot be configured in the old version, you need upgrade the old version to VRP1.74-0105 or VRP1.66-0005.
Otherwise, you may hear no sound after hooking off in the non fast connection mode. This problem does not occur in the fast-connect mode.

H323 descriptor
Version 1.74 modifies all the character strings related to huawei. For example, the value of H323 descriptor is changed from Huawei Gateway
to VRP Gateway. The default values of the two parameters are different, and cannot be distinguished from the aspect of configuration. Therefore, you must configure them in the same way.
It is suggested to configure the same descriptor (such as, VOIPGW) for each Huawei gateway in the network.

PS: Interworking between the latest version and other versions:
You cannot configure this parameter for versions earlier than 1.65-SP05, unless you upgrade them or use the Fast Connect feature at both ends.
For 1.65-SP05 and later versions, the default value of this parameter is Huawei Gateway. Therefore, you must configure the same descriptor (one word) for them as the latest version.
There are several process versions in version 1.74, so it is necessary to change the parameter to Standard Gateway, with the same application method as above.
For 1.74-0010 and later versions, the value of this parameter is VRP Gateway, and you need not modify it.
Therefore, you shall either configure the same h.323 descprit or unify the version. It is suggested to unify the version.