Hi, some questions/comments about performance/utility of * and * hardware I've been reading this list for a few weeks and I think I have compiled the better feelings of the users. please correct me if I'm wrong, still learning * .... Will be nice to see something like this in a wiki. After being flamed and corrected I will repost "clean" data.
1- Transcoding is the process of converting from one codec to another. Example from G.723.1 to G.729. 2- It does not matter if you're doing voicemail or a call. If one of the ends does not "speak" the same codec, transcoding is involved. 3- Transcoding is very CPU intensive and should be avoided when possible. 4- DSP based cards will improve * performance by offloading work from the CPU. 5- If you configure the SIP phones to use the same codec (G.729) . then no transcoding is involved when they talk to each other. 6- If you're doing VoIP to POTS/T1/E1 you're doing transcoding. 6a-If youre using G.711 as the codec and doing VoIP to POTS/T1/E1 you're NOT doing transcoding? 6b- More than 50 calls VoIP to POTS/T1/E1 will kill an * box due to excesive transcoding?????? 6bb- unless using quad machines, plenty of RAM and DSP cards????? File Codecs What codec should I use to save my voicemail and IVR prompts? Hardware DTMF generation and cut-through detection are features you must get on a card Integrated DSP Echo Cancellation is a must. any other features that I should go out and buy? * compatible hardware of course. Another off-this-topic question i read that the TDM cards from Digium are having some problems. Im just saying what i read. I have no intention to discuss the problems. But if this is true, then * VoIP players like Nufone with their 80+ * server farms.....are using what E1/T1/DS3/etc * compatible hardware? are Digium and VoiceTronix the only * compatible hardware? I googled a lot and found "will work with opensource apps" but do not explicitly say Asterisk. (Shido can you shed some light on this?) Since I am an end user/Unix sysadmin/VoIP learner I think I will ask the forum to give me the task of doing a wiki or update existing wikis and voip-info.org (when we all agree of course). I bought the * book from signate. It's very good but lack some things...I'm waiting for the next revision (if any). -- ------------------------------------------- Erick Perez Linux User 376588 http://counter.li.org/ (Get counted!!!) _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users