Supply, installation, and support of PABX systems, VoIP extensions, call routing, and Zycoo IP PBX for cleaner customer communication and internal collaboration across your Karachi office.
Real-world operational bottlenecks faced by Karachi businesses and our engineered solutions.
A reliable office phone system is the backbone of customer communication for any Karachi business. Arbre IT supplies, installs, and maintains both traditional PABX systems and modern IP telephony solutions — giving you the flexibility to choose the right technology for your team size and budget.
We deploy Grandstream and Zycoo IP PBX systems in Karachi, offering auto-attendant, call queuing, voicemail-to-email, call recording, and CRM integration. For businesses with multiple branches, our VoIP solutions connect all locations over a single unified phone system with internal extension dialling.
Our telephony team handles everything from site survey and cabling to system programming, user training, and ongoing maintenance. We also support legacy PABX systems from brands like Panasonic, NEC, and Avaya for businesses that need repairs or expansion.
Need custom sizing or an emergency on-site technician dispatch in Karachi? Contact our technical desk directly.
Call +92 313 2689511 Email InquiryClear, upfront PKR pricing tailored for Karachi businesses. No hidden surcharges.
Complete entry-level IP telephony bundle with auto-attendant IVR and digital call distribution.
Mid-sized corporate telephony system with multi-department queues and mobile softphone apps.
High-concurrency IP telephony architecture for call centers, brokerage trading floors, and multi-branch banks.
📍 Shahrah-e-Faisal Corporate Corridor, Karachi
Fix one-way audio where caller hears you but you cannot hear them (or vice versa) on Grandstream UCM IP telephony setups.
Troubleshooting Guide • 30 minProduction deployment guide for Grandstream UCM6302 IP-PBX with Pakistani telecom SIP trunks (PTCL, Nayatel, Cybernet): dedicated optical VLAN routing, NAT traversal, codec priority, and IVR auto-attendants.
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Common questions regarding our PABX & IP Telephony in Karachi.
A traditional PABX uses physical copper phone lines and analogue or digital handsets. VoIP (Voice over IP) routes calls over your computer network and internet, enabling lower call costs, mobile softphone apps, and advanced features like call recording and CRM integration.
Yes. We supply, program, and maintain both Grandstream UCM series (UCM6300/6200) and Zycoo CooVox IP PBX systems with complete warranty and local on-site engineer support.
Yes. Using VoIP trunks and SIP extensions, we can connect all your Karachi branches — or offices across Pakistan — on a single unified phone system with free internal calls between locations.
Yes. We repair and expand existing legacy PABX systems from Panasonic (TES824, TDA series), NEC, Avaya, and other brands, supplying replacement cards, cabling, and operator consoles.
Each active VoIP call using the standard G.711 codec requires approximately 85 kbps upload and download bandwidth. A 10-line simultaneous office requires under 1 Mbps dedicated bandwidth, which we isolate using router QoS.
Yes. We configure mobile softphone apps (like Grandstream Wave) that connect over 4G/Wi-Fi, allowing staff to make and receive office extension calls anywhere with seamless call transferring.