Asterisk 1.8.xxx to Move Asterisk 13

Hello Dear Asterisk Community, How are you All.
I need Help please, i want to Move Asterisk 1.8.xx to Asterisk 13.xx is it possible?. And this two version Same PHP AGI is it working fine or need to change anything please.
I have developed PHP billing based asterisk 1.8.xxx version, Nkw i want to Move Asterisk 13 Version.
Please Help and support me.
If any One can be help and Need Any charges i will be paid.
Thanks
Md Sumon
Call + WhatsApp: 00973 33 699 727

Asterisk 13 is also past end of life. You should be moving to 18

1.8 to 18 is a big jump. You need to read all the UPGRADE file for the intermediate and target version. The degree of difficulty will depend on what features you have actually used.

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