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Hire a skilled freelance Asterisk developer to build multi-protocol, real-time communications applications solutions for all your needs. Experienced Asterisk contractors can set up predictive dialers, call centers, VoIP gateways, conference servers, IP PBX systems and other applications.

Asterisk is a popular open source framework for building communications applications. The platform uses scripting languages to create business phone systems, conference bridges and other communications protocols and technologies. On Upwork, the world’s largest online workplace, companies hire Asterisk experts to handle all their communication needs.

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Last updated: October 1, 2015
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Vlad M.

Vlad M.

Network Expert CCIE Cisco Juniper Brocade router switch firewall VoIP

United States - Tests: 6 - Portfolio: 1

**Sr Network Engineer (Cisco CCIE, Juniper, Brocade,Foundry, Aruba)**, with 14 years of experience, located in San Francisco, California. Consulting services in the following **areas of my expertise:** Design, Planning, Configuration, Troubleshooting, Optimization, Review, Capacity Planning, Security Assessment, Documentation, Troubleshooting, Training, etc. **QUALIFICATIONS (Cisco, Foundry, Juniper, Wireless, Aruba)** **Network Engineer** (Cisco, Juniper, Foundry: CCIE, CCNP/CCDP/CCIP, CCSP, CCIP, JNCIS, FNCNE/FNCNP; CCNA-Voice; CCIE R&S;) **Network Security Engineer** (CCSP, Cisco Security/Firewall/VPN; CCSA/CCSE+, CISSP) **Wireless Network Engineer** (CWNA, CWSP, CWAP/CWNE) **System Engineer / System Administrator** (Windows, Unix) **SKILL SUMMARY **Expert in network design, implementation, and troubleshooting in Cisco and multi-vendor environments. Expert in all aspects of IP routing, switching, security and wireless technologies. **Core Technologies: **OSPF,BGP,EIGRP,RIP;MPLS,WAN,LAN,WLAN;L2:STP,RSTP,VRRP,HSRP;VPN,IPSec; QoS, VoIP,IPTel; 802.11 Wireless; Call Manager,CUCM, Asterisk **LAN, WAN, WLAN**: Multilayer IP networks with Cisco and multi-vendor routing and switching **Network Security and Wireless: **Cisco PIX, ASA, FWSM, VMS, CSM, ACS, RADIUS, TACACS+, SLB, IDS/IPS, VPN, PKI, SSL VPN, 802.1x Wireless 802.11 and wired multi-vendor security implementations **Hardware:** Cisco, Foundry/Brocade, Juniper/NetScreen, Aruba

$50.00 /hr
103 hours

Robert M.

Robert M.

Networking/VoIP/Build/Test/SQA Professional

United States - Tests: 4 - Portfolio: 1

I'm proficient in networking (Cisco - working on CCNA), operating systems (Linux, UNIX, Windows, MacOS and a few others) as well as Open Source PBX systems such as Asterisk, Trixbox, FreePBX, Elastix and PBXInAFlash. I have done extensive SQA (software testing) as well as scripting (bash) for administration of various servers. I can code in Python, PHP and some Java and Java Enterprise. I've worked extensively with Jenkins for build/deployment environments. I'm quite skilled with web application type servers, including Apache, Tomcat, JBoss, as well as various mail relays - Postfix and Sendmail. When it comes to security, I'm quite proficient at the command line with iptables as well as some open source type firewalls (Sonicwall). I am no stranger to packet analysis/sniffing a network with tools such as Wireshark, ettercap and nmap.

$25.56 /hr
118 hours

Bhushan Kumar Sharma

Bhushan Kumar Sharma

Linux Servers AWS Cloud Hosting Security CPanel Plesk VOIP PenTest

India - Tests: 4 - Portfolio: 14

Since 2001, I have been dedicatedly working with Linux Operating Systems & Open Source. Services Provided ::- Deployment, Configuration, Security, Hardening, Monitoring, Performance Tuning, Troubleshooting of Linux Server Roles AWS – Amazon Web Services Migration of Servers Hosting Panels like WHM/CPanel, Plesk etc Asterisk Dialers, VOIP and Call Center Solutions Customization of Linux Kernel & Distro with Rebranding Faculty of Post-Graduate Degree in Computer Sciences. Firewalls & Gateways Linux HPC - High Preformance Clusters Remote Server Support & Troubleshooting L3/L4 Security Auditing of Servers & Websites Cloud & Virtualization Technical Writing VPN - Site-to-Site, Road-warrior Vulnerability Assessment & Penetration Testing Kayako

100% Job Success
$16.67 /hr
4,017 hours

Imran A.

67% Job Success
$18.00 /hr
122 hours

Łukasz Dróżdż

Łukasz Dróżdż

NLP Scientist, Software Developer, Translator

Poland - Tests: 7 - Portfolio: 8

Computational Linguist, Software and Database Developer with experience in a wide variety of scientific projects. Particularly interested in text mining and information retrieval technologies. Work experience in SQL database development, web scraping, web development. Freelance translator with experience in general and technical translation, software localisation, consecutive and simultaneous interpreting.

88% Job Success
$33.33 /hr
680 hours

Ahmed Qadeer

Ahmed Qadeer

Expert in Linux and Blog writing

Pakistan - Tests: 3 - Portfolio: 2

I am working as Linux Administrator in a multi national firm for almost three years. My expertise include Apache, Mysql, PhP , Kannel, Nodejs, Asterisk, Opensips, VPS related issues. I have extensive experience in System Administration from Installation to deployment and maintenance using major open source softwares like Nagios, Monitorix, Monit, Cacti and Zabbix. I am very comfortable in working on Cpanel and SSH. Meanwhile I do blog writing as a hobby due to which I have been associated with "Uploadessays" for one year. My own Technical blog is

69% Job Success
$12.00 /hr
30 hours

Shaila S.

Shaila S.

Web Research, Technical writing

Bangladesh - Tests: 3

I am hard working, honest, self-motivated professional; experienced technical support representative and Helpdesk who welcomes challenges associated with driving performance, performance improvement and customer satisfaction. I am working as a core network engineer in an Wimax company.As I only work 8 hours a day 5 days a week ,i have plenty of time to work in upwork I can better serve you in following ways: • Install, configure, maintain and troubleshoot DNS, Web, Proxy, FTP and Centralized Syslog Servers. • Configure and maintain mail servers (postfix, sendmail, qmail). • Configure, maintain ,Adding extension with outbound number, Troubleshooting and report generating of Elastix Server & Asterisk (PBX) • Attack Mitigation: DNS Amplification Attacks, DDoS Attacks, Spamming; Capture & analyse internet traffic packets using Wireshark and other tools for troubleshooting/diagnosis purpose and problem resolution • IP Core Network: IPv6 planning & implementation, EGP protocol (BGP ), IGP protocol (OSPF, EIGRP, IS-IS), Load balance protocol (VRRP, HSRP), Firewall (Cisco ASA, Juniper NetScreen, SRX) • Working with bandwidth shaping tasks using MikroTik Routers and ET/BWMGR • Work extensively with VPN, Router, Switches, Firewalls and Intrusion Prevention Systems (IPSs). • Site-to-Site VPN establish & VPN over Wireless Network & fiber (GRE, IPSEC, SSL-VPN) • Infrastructure design for new clients according to their demand. HLD & LLD design of Network: Access, Distribution & Core layer • Configuring and maintenance Mikrotik Routers with Wi-Fi system. a. NAT, Port forward, Fault Tolerance, Application layer Filtering, Service Prioritization. b. Bandwidth Shaping, Declaring separate Queue both for management and other employee with different speed. c. Assigning no bandwidth limit for internal applications like Mail, CMS, Alepo, ERP, and website. d. Applying restriction for non-official application with IP and content based filtering. e. Site-restrictions with Scheduling.

$3.33 /hr
86 hours

Chris Rivas

Chris Rivas

Hosting Industry Sr Linux Admin w/ RHCE, RHCVA, MySQL DBA, developer

United States - Tests: 7 - Portfolio: 1

For more than ten years I have worked extensively in the software development and hosting industries. I am an expert Linux and Unix system engineer, and can deploy and configure any software stack that is based on Linux for optimal content delivery. I excel at MySQL database design, optimization, and administration. I am a seasoned software developer and have extensive experience with many languages including Java, Python, PHP and Ruby. I also have significant experience with customizing, deploying, and adminstering open source web applications, application frameworks, and application servers. I have worked locally, overseas, and with colleagues and clients overseas via the internet. If you look at my work history here, you will note that i 'disappeared' in February 2011. Indeed I did disappear, I was in a very bad car accident in Bangkok, Thailand, where I was living at the time, and was nto able to get out of bed or use a phone or computer for roughly a month. I now reside in Austin, TX again full-time I do not disappear typically, my present and previous employers can confirm that if you are hesitant based on feedback from 2011.

$36.67 /hr
22 hours

Nizhi Saeba

Nizhi Saeba

Asterisk and Linux System Administrator

Mexico - Tests: 5 - Portfolio: 2

I have 10 years working with Asterisk, Linux, Postfix, Apache (and others). Actually i'm studying a bachelor in computer science at UNAM (Mexico) with focus on Data minning, Big Data, and Data Science. In the past i worked at comunications enterprise who has a large amount of office over a lot of cities in Mexico and Central America (Panama, Honduras, Nicaragua, Costa Rica, Dominic Republic), they have now a single callcenter where all calls that inbound from all cities, drops into that callcenter via VoIP with SIP over Asterisk. On the other hand, we build a system for automatic outbound calls for agents to prospect sales. I was also in charge of deployment of servers, Asterisk, Apache/PHP/Django (for web administration and web access for call agents), IPTables (for security), Squid (a web cache proxy for content filtering), Postfix+Dovecot for email, and a large of etcetera, all over ubuntu server and debian linux servers. often i wrote about my work, discoveries, advances and achievements in my blog at

$16.00 /hr
15 hours