Top Session Initiation Protocol freelancers

106 freelancers list Session Initiation Protocol on Upwork.

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Showing 50 of 106Data updated Nov 7

# Freelancer		SinceMember since
Murali Mohan K. 🇮🇳🇮🇳 Asterisk,Freeswitch,Janus,WebRTC,iOS,Android,Flutter,c,c++,Windows,Mac	$10k↑ 3%	Sep 2011Sep 17, 2011
Oleg K. 🇨🇷🇨🇷 Senior VoIP Software Engineer	$8k↓ 7%	Jul 2013Jul 17, 2013
Peter S. 🇺🇸🇺🇸 Sr Systems/Network Engineer	$7k↑ 2%	Aug 2018Aug 20, 2018
4 Aram M. 🇦🇲🇦🇲 WebRTC, LiveKit, SIP, VoIP, AI Agents, Nodejs, Go, Software Architect	$5k↓ 1%	Oct 2014Oct 25, 2014
5 Malay P. 🇮🇳🇮🇳 VoIP & SIP, FreeSWITCH, Kamailio, OpenSIPS, Asterisk, PHP, SQL, Linux	$4k↑ 6%	Oct 2010Oct 3, 2010
6 Rizwan A. 🇵🇰🇵🇰 Full Stack Developer \| Java Spring Boot, MERN Stack, REST APIs	$4k↑ 2%	Apr 2011Apr 21, 2011
7 Rene Fernando W. 🇭🇳🇭🇳 Telecommunications Consulting Engineer with Packet Core expertise	$4k↑ 27%	Apr 2016Apr 2, 2016
8 Nikolay S. 🇦🇪🇦🇪 LiveKit WebRTC SIP/VoIP Electron AI - SaaS & Video Software Architect	$4k↓ 6%	Sep 2011Sep 16, 2011
9 Pargat S. 🇮🇳🇮🇳 Senior React/Next.js Developer \| Node.js \| WebRTC, XMPP & Erlang	$4k↓ 15%	Nov 2015Nov 26, 2015
10 Moniruz Z. 🇧🇩🇧🇩 Odoo 19 Certified Partner \| FreeSWITCH VoIP & AI Voice \| WhatsApp API	$3k↑ 11%	Apr 2013Apr 20, 2013

Freelancer	MRR	Member since
11 Ahmed R. 🇵🇰🇵🇰 VoIP \|Freeswitch\|Kamailio\|Opensips\|Jambonz\|Conversational AI Expert	$3k↑ 1%	Aug 2015Aug 30, 2015
12 Amin F. 🇦🇪🇦🇪 Amazon Connect Expert \| AI Agents, Salesforce CTI, Lex, Bedrock & VoIP	$3k↓ 14%	Oct 2025Oct 2, 2025
13 Francois E. 🇺🇸🇺🇸 UCaaS/CCaaS & VoIP Architect \| 3CX Advanced Certified	$2k↑ 6%	Oct 2025Oct 9, 2025
14 Glenn R. 🇵🇭🇵🇭 Asterisk Ninja / VoIP Consultant	$2k↑ 18%	Dec 2015Dec 4, 2015
15 Carlos P. 🇪🇪🇪🇪 UC & CCaaS Consultant	$2k↓ 19%	Nov 2018Nov 1, 2018
16 Nicole N. 🇨🇭🇨🇭 Commercial employee with a flair for writing	$2k↑ 10%	Jan 2024Jan 5, 2024
17 Pavel S. 🇷🇸🇷🇸 System Administrator \| DevOPS \| Cloud Specialist \| VPN & Proxy Expert	$2k↑ 20%	Oct 2014Oct 30, 2014
18 Christopher R. 🇺🇸🇺🇸 Sr. VoIP Specialist	$2k↓ 19%	Oct 2016Oct 8, 2016
19 Sadique A. 🇮🇳🇮🇳 Full Stack Developer, Cloud Telephony Expert	$2k↓ 1%	Oct 2014Oct 13, 2014
20 Vahan A. 🇦🇲🇦🇲 VoIP expert	$1k↑ 3%	Mar 2017Mar 10, 2017

Freelancer	MRR	Member since
21 Rakesh M. 🇮🇳 NewNew🇮🇳 Senior 5G NR / 4G LTE Protocol Test Engineer \| QXDM, UE & Cloud RAN	$1k–	Sep 2026Sep 22, 2026
22 KIRK DOUGLAS D. 🇵🇭🇵🇭 AI Automations, GHL & Content Strategy Specialist	$1k↑ 3%	May 2011May 19, 2011
23 Tahir M. 🇺🇸🇺🇸 Voice AI & Full-Stack Engineer \| LiveKit, Node.js, TypeScript, AWS	$1k↓ 2%	Oct 2018Oct 8, 2018
24 Simon S. 🇧🇪🇧🇪 Microsoft Teams Phone/Voice & Rooms \| Office365 \| Audiocodes SBC	$1k↑ 12%	Oct 2022Oct 2, 2022
25 Pankaj K. 🇮🇳🇮🇳 VoiceAgent AI Automation VoIP & SaaS \|FreeSWITCH Fusion PBX & LiveKit	$1k↑ 10%	May 2009May 29, 2009
26 Janette B. 🇵🇭🇵🇭 VoIP Technical Support \| PBX Setup \| SIP \| IP Phone Configuration	$1k↑ 4%	Aug 2021Aug 18, 2021
27 Asim Y. 🇵🇰🇵🇰 Linux Expert	$1k↑ 2%	Apr 2013Apr 1, 2013
28 Andrew M. 🇺🇸🇺🇸 Unified Communications and Collaboration Cisco, Webex, Microsoft Teams	$624↑ 4%	Aug 2016Aug 17, 2016
29 Eseoghene S. 🇳🇬🇳🇬 VoIP & SIP Engineer \| Carrier Infrastructure \| SBC \| AI Voice	$508↓ 40%	Aug 2021Aug 11, 2021
30 Ambiorix R. 🇩🇴🇩🇴 VoIP Expert \| Help Desk Support \| \| Customer Support Specialist	$420↑ 26%	Aug 2014Aug 29, 2014

Freelancer	MRR	Member since
31 Abdul H. 🇵🇰🇵🇰 AWS Telephony Infrastructure Engineer \| SIP, VoIP, Lambda, Terraform	$399–	Jan 2026Jan 26, 2026
32 Alaeddine H. 🇹🇳🇹🇳 VoIP Engineer:AI Agent,Asterisk, FreePBX, Kamailio, Linux, IVRs	$332↓ 3%	May 2020May 1, 2020
33 Slobodan P. 🇷🇸🇷🇸 Mobile app developer	$314↓ 33%	Mar 2016Mar 1, 2016
34 Dave M. 🇮🇳🇮🇳 Expert UKG, WorkDay,Telephony Developer, LOS integrations, IT Services	$301↓ 1%	Mar 2019Mar 2, 2019
35 Zahid H. 🇵🇰 NewNew🇵🇰 WhatsApp Calling & Asterisk VoIP Engineer \| Kamailio, SIP, LTE Nokia	$201–	Oct 2021Oct 11, 2021
36 Usama A. 🇵🇰🇵🇰 3CX \| VoIP \| Bicom \| PBXware \| Vital PBX \| Ring Central \| EXPERT \|	$133↓ 25%	Jul 2019Jul 31, 2019
37 Rabbani M. 🇦🇺🇦🇺 VoIP Engineering & Specialist Experience in PBX, SBC & Microsoft Teams	$117↓ 52%	Feb 2018Feb 10, 2018
38 Faisal A. 🇵🇰🇵🇰 Telephony Architect \| FreePBX, Asterisk, 3CX \| Call Centers \| 12+ Yrs	$99↑ 15%	Sep 2014Sep 20, 2014
39 Leul M. 🇪🇹🇪🇹 Expert Kamailio/FreeSWITCH/Asterisk, Django\|React, Fullstack Developer	$83↓ 1%	Oct 2018Oct 10, 2018
40 Luis Carlos H. 🇨🇷Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.🇨🇷 Senior Voice Engineer \| Zoom Phone Administrator \| Voice AI Agents	≈$77–	Jun 2024Jun 12, 2024

Freelancer	MRR	Member since
41 Vahagn K. 🇦🇲🇦🇲 VoIP & Voice AI Engineer \| FreeSWITCH, Kamailio, Asterisk, Speech/LLM	$66↑ 32%	Sep 2017Sep 2, 2017
42 Sarmad S. 🇵🇰🇵🇰 VoIP & Call Center Engineer \| VICIdial, FreeSWITCH, AI Voice Agents	$32↓ 44%	Jan 2020Jan 9, 2020
43 Amardeep A. 🇮🇳🇮🇳 Whatsapp2sip,AI, Voicebot, Asterisk, SIP, VOIP, WebRTC,Realtime stream	$29↓ 1%	Jan 2013Jan 24, 2013
44 Aadil M. 🇫🇷🇫🇷 Senior VoIP Architect \| Avaya & 3CX Solutions Specialist	$28↓ 1%	Dec 2024Dec 16, 2024
45 Anar A. 🇬🇪🇬🇪 Expert VoIP engineer and system administrator	$25↓ 1%	Sep 2015Sep 24, 2015
46 Junaid f. 🇵🇰🇵🇰 Asterisk Developer \| 3cx, Asterisk, FreePBX, Voice AI & Automation	$19↑ 659%	Nov 2019Nov 10, 2019
47 Ankur S. 🇦🇺🇦🇺 Expert CCaaS Solutions Architect \| AI & Cloud Integration Specialist \|	$12↓ 1%	Apr 2012Apr 14, 2012
48 Ifeadika I. 🇳🇬🇳🇬 VoIP Engineer \| PortaOne,Telinta , 3CX , Cisco , Vos3000, Ms-Teams	$10↓ 1%	Dec 2022Dec 28, 2022
49 Tho N. 🇻🇳🇻🇳 Expert Unified Communications Administrator.	$10↓ 1%	Nov 2022Nov 21, 2022
50 Jorge III T M. 🇵🇭🇵🇭 VoIP & Linux Systems Engineer \| VICIdial \| Asterisk \| L2/L3 Support \|	$7↓ 61%	Jul 2010Jul 26, 2010

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