SL1000 and a new 9th digit in the cellphone systems,

[I-Me-Mysefl]

Hi people.
I need some help with a SL1000 configuration. Here we had a change in the public cellphone system
where a more digit, a 9th digit was appended in the leftmost number syntax, changing from 8 size
digit scheme to a 9 size one. Ex: 8888-7777 is now working in the 9-8888-7777 address.
In fact the 9th digit is fixed to be the number "9" making the syntax 9-XXXX-XXXX now.

The problem:
- Our multiline NEC/IP4WW terminals are still making calls to the new cellphones numbers sintax. They are ok.
- Our single-line cant do it anymore. Even if we type the complete syntax - 9 digits - a voice message from the public
cellphone system is returned warning us about the lack of 9th digit. BUT when we change these single-line to pulse
everything works fine. The problem is just in the DTMF mode.

Please, any help with this stuff?

Regards