Engineering capabilities
- Extensions, IVR and queue configuration
- Trunk and route management
- Call recording and reporting
- Migration from legacy Elastix builds
VoIP
Issabel PBX
Asterisk-based unified communications distribution with an integrated web console, favoured where a full appliance-style build is wanted on commodity hardware.
Security & hardening
- TLS/SRTP transport
- Fail2ban and source restriction
- Panel access limited to management network
Issabel PBX reference architecture
An Asterisk core with an integrated console: the panel is treated as management only, while trunks, media and recordings sit behind their own controls.
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01
Carrier edge
- Primary SIP trunk
- Backup trunk
- PSTN gateway
Registration or IP authentication per trunk with a defined failover order.
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02
Border
- Edge firewall
- Fail2ban
- SIP ALG disabled
Only carrier and known extension ranges reach signalling ports; TLS and SRTP where endpoints support them.
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03
Issabel core
- Asterisk engine
- Web console
- IVR & queues
- CDR database
Console access restricted to the management network; configuration exported for version control.
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04
Endpoints
- Desk phones
- Softphones
- Remote agents
Provisioning templates per model; remote users reach the PBX over VPN rather than open SIP.
Frequently asked questions
Is Issabel a safe upgrade path from Elastix?
Yes, it is the community continuation of that lineage. Migrations are rebuilt from a configuration inventory rather than copied verbatim, because old dial plans usually contain rules no longer in use.
Issabel or FreePBX?
Both are Asterisk front-ends. FreePBX has the larger module ecosystem and commercial add-ons; Issabel suits teams that want the all-in-one appliance model. The underlying engineering is the same.
Can Issabel handle call-center traffic?
For moderate queue-based volumes yes. For predictive outbound at scale a purpose-built dialler platform and separate trunk capacity planning are the correct answer.
Scope the work before you commit budget
Send the environment details and get an engineered proposal with assumptions, risks and a rollback path.