Standardized code in .NET Generation pdf417 2d barcode in .NET Standardized code

Standardized code using none tointegrate none on web,windows application isbn 13 [ 212 ]. Download at Boykma.Com 11 . However, using a GUI ensures that the majority of the code produced will be very structured, and having been tested by many developers, beta testers, and end users, there is a high degree of confidence that it will do what is expected of it without any "gotchas".. GUI, phooey!. Performance Stability For all the po none for none sitive reasons for using a GUI, there are also a number of arguments against going down that route. In general, they relate to the added complexity of a system running a graphical interface and fall under the following headings:. Restricted functions In order to ru none none n a graphical interface, the Linux server at the core of each Asterisk system is required to install and run a number of extra packages. Many GUI implementations are based on a so called LAMPA architecture, standing for Linux, Apache, MySQL, PHP, Asterisk. Of these packages, only the Linux core and Asterisk are absolutely needed to implement the telephony functionality, the rest is needed to enable the GUI.

This requires extra memory, disk and processing power of the host PC/server, which is not a huge concern if you are implementing a standalone PBX for a relatively small office, but if you are rolling out a system for thousands of users over dozens of sites, then all those costs start adding up. Although, in the real world, many Asterisk boxes without a GUI will still run Apache, MySQL, and PHP to allow them to store call data effectively and use AGI (Asterisk Gateway Interface). This obviously narrows the performance gap between GUI and non-GUI.

Even in a single-site scenario, if the number of users and call throughput is high, then, by choosing a GUI-based system in preference to one without a GUI, you can end up with a more complex and expensive system. For instance, in a call centre, a "vanilla" PBX with reasonable hardware spec will cater for most requirements, as it is not unusual for such a setup to be capable of handling well over 100 concurrent calls. With a GUI-based system, you may need to implement two or more servers to achieve the same goal.

You then need to consider which server(s) handle inbound calls, how calls are handed off between servers, and how to cater for the failure of a server. In short, you will probably need to implement server clusters earlier with a GUI-based setup..

Performance [ 213 ]. Download at Boykma.Com Graphical User Interfaces Another perfor mance hit of GUI-based systems comes from the use of rather complex code in the dialplan. Let"s look at the code produced by FreePBX for initiating an outbound call as an example..

[macro-dialout none for none -trunk] include => macro-dialout-trunk-custom exten => s,1,Set(DIAL_TRUNK=${ARG1}) exten => s,n,ExecIf($[$["${ARG3}" != ""] & $["${DB(AMPUSER/${AMPUSER}/ pinless)}" != "NOPASSWD"]],Authenticate,${ARG3}) exten => s,n,GotoIf($["x${OUTDISABLE_${DIAL_TRUNK}}" = "xon"] disabletrunk,1) exten => s,n,Set(DIAL_NUMBER=${ARG2}) exten => s,n,Set(DIAL_TRUNK_OPTIONS=${DIAL_OPTIONS}) exten => s,n,Set(GROUP()=OUT_${DIAL_TRUNK}) exten => s,n,GotoIf($["${OUTMAXCHANS_${DIAL_TRUNK}}foo" = "foo"] nomax) exten => s,n,GotoIf($[ ${GROUP_COUNT(OUT_${DIAL_TRUNK})} > ${OUTMAXCHANS_${DIAL_TRUNK}} ] chanfull) exten => s,n(nomax),GotoIf($["${INTRACOMPANYROUTE}" = "YES"] skipoutcid) exten => s,n,Set(DIAL_TRUNK_OPTIONS=${TRUNK_OPTIONS}) exten => s,n,Macro(outbound-callerid,${DIAL_TRUNK}) exten => s,n(skipoutcid),AGI(fixlocalprefix) exten => s,n,Set(OUTNUM=${OUTPREFIX_${DIAL_TRUNK}}${DIAL_NUMBER}) exten => s,n,Set(custom=${CUT(OUT_${DIAL_TRUNK},:,1)}) exten => s,n,GotoIf($[$["${MOHCLASS}" = "default"] . $["foo${MOHCL ASS}" = "foo"]] gocall) exten => s,n,Set(DIAL_TRUNK_OPTIONS=M(setmusic^${MOHCLASS})${DIAL_ TRUNK_OPTIONS}) exten => s,n(gocall),Macro(dialout-trunk-predial-hook,) exten => s,n,GotoIf($["${PREDIAL_HOOK_RET}" = "BYPASS"] bypass,1) exten => s,n,GotoIf($["${custom}" = "AMP"] customtrunk) exten => s,n,Dial(${OUT_${DIAL_TRUNK}}/${OUTNUM},300,${DIAL_TRUNK_ OPTIONS}) exten => s,n,Goto(s-${DIALSTATUS},1) exten => s,n(customtrunk),Set(pre_num=${CUT(OUT_${DIAL_TRUNK},$,1)}) exten => s,n,Set(the_num=${CUT(OUT_${DIAL_TRUNK},$,2)}) exten => s,n,Set(post_num=${CUT(OUT_${DIAL_TRUNK},$,3)}) exten => s,n,GotoIf($["${the_num}" = "OUTNUM"] outnum:skipoutnum) exten => s,n(outnum),Set(the_num=${OUTNUM}) exten => s,n(skipoutnum),Dial(${pre_num:4}${the_num}${post_ num},300,${DIAL_TRUNK_OPTIONS}) exten => s,n,Goto(s-${DIALSTATUS},1) exten => s,n(chanfull),Noop(max channels used up). [ 214 ]. Download at Boykma.Com 11 exten => none none ; s-BUSY,1,Noop(Dial failed due to trunk reporting BUSY giving up) exten => s-BUSY,n,Playtones(busy) exten => s-BUSY,n,Busy(20) exten => s-NOANSWER,1,Noop(Dial failed due to trunk reporting NOANSWER - giving up) exten => s-NOANSWER,n,Playtones(congestion) exten => s-NOANSWER,n,Congestion(20) exten => s-CANCEL,1,Noop(Dial failed due to trunk reporting CANCEL giving up) exten => s-CANCEL,n,Playtones(congestion) exten => s-CANCEL,n,Congestion(20) exten => _s-.,1,GotoIf($["x${OUTFAIL_${ARG1}}" = "x"] noreport) exten => _s-.,n,AGI(${OUTFAIL_${ARG1}}) exten => _s-.

,n(noreport),Noop(TRUNK Dial failed due to ${DIALSTATUS} - failing through to other trunks) exten => disabletrunk,1,Noop(TRUNK: ${OUT_${DIAL_TRUNK}} DISABLED falling through to next trunk) exten => bypass,1,Noop(TRUNK: ${OUT_${DIAL_TRUNK}} BYPASSING because dialout-trunk-predial-hook) exten => h,1,Macro(hangupcall,) ; end of [macro-dialout-trunk]. As you can see , there is a lot of code here just to make a simple trunk call. However, for a coding novice, this will implement all the checks and error handling that you are ever likely to need. It is impossible to say how much of a performance hit a GUI-based system will incur over a "vanilla" system, as all systems and requirements are unique.

However, when planning your system, the extra resources required for a GUI, however small, should be factored into the equation..
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