Issue Description
Q:
AR series routers can use PBX function, version is V200R001C01SPC500, when number changes after routing, add or delete the start location parameter of number (del-offsetval,insert-offset), it means counting from start of long-number or end of long-number.
Handling Process
A:
You should count from start, i.e. from right to left, for example, insert number 6 from NO.5 location of long-number 012345, it means insert number 6 before 1.
