Cite
APA Citation
Unknown (2009). FreePBX 2.5 powerful telephony solutions : configure, deploy, and maintain an enterprise-class VoIP PBX. Birmingham, UK : Packt Pub. http://access.bl.uk/ark:/81055/vdc_100035548059.0x000001
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Unknown (2009). FreePBX 2.5 powerful telephony solutions : configure, deploy, and maintain an enterprise-class VoIP PBX. Birmingham, UK : Packt Pub. http://access.bl.uk/ark:/81055/vdc_100035548059.0x000001