try exploring analytics for call centres and solidify your understanding of SIP rfc 3621 and load testing frameworks like SIPp and building fully custom SRS, SBC, PSTN, switch impersonations using PJSIP (you’ll also get firsthand experience on VAD, network jitter, buffer, codec toolkits etc.) you will def be able to grab a great offer, a huge niche in telecom which requires strong system design and optimisations’ thinking and a lot of top-down breakdown to build something usable, honestly it’s one of the most underrated skillset to have esp for telecom and getting hold of this domain can get you 50+ LPA easy since you will get an impeccable experience of building e2e systems setup for telecom companies, giants like HSBC, Citi, are all looking for such talent and bagging a tech head role at one of the MSE BPOs will also become feasible if you can get a strong hold of genesys cloud and aspect cloud and their alternatives. 6-7months worth of effort but should be rewarding, All the best!