Muhammad S.
VoIP, Asterisk, Hosted Call Center, ViciDial, Kamailio, IVR, WebRTC
I have more than 13years of experience with different VoIP tools Especially Asterisk, Vicidial, Freeswitch, Kamailio and OpenSips. I got hands on experience of Asterisk, Call center development, Click2Call, Callback, A2billing, Vicidial, AGI custom script writing, IVR development using PHP, Mysql. I have great experience with: - Call Center development - Call Center Hosted solution (Ready to use) - Call Center CC USA, UK and other countries Carriers - Multi-tenant PBX development - WebRTC (Web Phone) -Vicidial(predictive auto dialer) CRM integrations, custom reporting, wallboard, dashboard etc. - Distinctive Dial Plans and IVR Development - VoIP billing solution development - Asterisk Integration with Web Applications and CRMs. - AGI and AMI script writing - FreePBX for small office/home offices
Earnings and projects
Last 6 months ÷ 6
Last 6 months: $198
Billed in all: $36,885$37k
$198 in the last 6 months
Across 101 contracts
Earnings, last 30 days
Read once a week before Oct 15, 2026, daily since. Dotted: longer than usual between two readings. Hatched: over two weeks without one.
Skill rankings: Top 23% in OpenSIPS
Ranked by MRR among everyone on Upwork with the skill.
- #8OpenSIPS35 freelancers · 🇵🇰 #2Top 23%🇵🇰#2 of 8
- #17Kamailio45 freelancers · 🇵🇰 #3Top 38%🇵🇰#3 of 6
- #29FreeSWITCH85 freelancers · 🇵🇰 #8Top 34%🇵🇰#8 of 17
- #33FreePBX120 freelancers · 🇵🇰 #7Top 28%🇵🇰#7 of 22
- #34SMS Gateway81 freelancers · 🇵🇰 #7Top 42%🇵🇰#7 of 11
- #43VICIDIAL124 freelancers · 🇵🇰 #15Top 35%🇵🇰#15 of 30
- #65Asterisk211 freelancers · 🇵🇰 #12Top 31%🇵🇰#12 of 39
- #70VoIP Software176 freelancers · 🇵🇰 #9Top 40%🇵🇰#9 of 17