Outside of that, you will need to be able to explain the period where you had a break in between or something, which made your work in the field less than 5 years.
Am also from same Telecom background , but you seems to be not qualify for either promise nor talent.
Please read the technation guide lines you need to have lot of qualifications and lot of work to do if you need to get this visa.
MC : Lead a conference and developed a product for NGO or product led company to show your a leadership in your field.( proof media or news cut mandatory)
OC2: Mentoring a startup or university students , lead a conference.( proof media or news cut mandatory)
OC3 : Developed a product for your company which turned to be huge success , proof certificate or award or appraisal letter.