I have 3 more years of asterisk and asterisk a2billing, 6 years of voip expreinces,it includes every aspect of voip business,from ATA Devices to Softswitch, Billing,softphone ,callshop,callingcard,callback,DID,H323,SIP,GNUGK,ASTERISK,FREERADIUS,MYSQL,PHP,OPENSER,IPPBX ,LINUX ,CLUSTER CONFIGS,LINUX HA CONFIGS,hope my expereince can help you fast,so you don't need dig into one problem with much time.
sample questions like :
please post your questions below (as comments),so I can answer you ,if your questions can be replied with less than 5 sentences,then I am willing to answer you free of charge,if this involve digging into your system,or very specific question please pay first,
price is 30 USD/1 hour, minimum is 30 USD.
my paypal: dingdang1204@gmail.com
Besides instant voip support,I am always willing to take some projects from you ,I can do voip projects,web programming,etc,I am reliable,fast,cost-effective,honest,no advanced payment.
please send me email ,or comment below