On 2/02/2009 11:12 p.m., Chris Knipe wrote: > Hi, > > We're running on a * 1.4.21 system. We run about 80 SIP Extensions, mainly > ATCOM phones (and a few Snoms - 300 and 360), and have an additional 80 IAX2 > extensions to iaxmodem devices for fax2email. We are rapidly growing and > will be adding an additional PRI trunk and grow to about 150 SIP & IAX2 > extensions towards the end of the year. > > We have two Digium Wildcard TDM800P cards (8 x FXO and 8 x FXS) and are busy > migrating the remaining 8 analogue lines over our ISDN Pri line. The TDM > cards are without hardware echo cancellation boards. The 8 Analogue > extensions are mainly for traditional paper Fax Machines. > > Our main trunk is a Digium Quad Port PRI Card (PCIe) - with a hardware echo > cancellation board: > Span 1: TE4/0/1 "T4XXP (PCI) Card 0 Span 1" (MASTER) HDB3/CCS/CRC4 ClockSource > Timing slips: 1 > Only 1 of the 4 spans are being used, the other three has been disabled > completely. > > We are getting very strange results on some very intermittant calls. It is > not isolated to a single extension or calls to/from a single destination. > It seems that on random occasions, there are very bad echo (calls via the PRI > trunk), it sounds like Silence Supression is being used, and there seems to be > isolated cases that seems to sound more like a sidetone than echo on actual > conversations / handsets. All these are only occuring on external calls, > internal calls are working flawlessly. > > We've pretty much had this issue intermittantly since day one, had certified > Digium consultants look at it, independent audits was done, various settings > has changed and debugged from the Telco side, but those three issues persist, > and just won't go away. Everyone that looked at the system so far, gave it a > pretty clean state and congratulated us on a very well implemented > installation. > > I am currently using my PRI as my clock source, as indicated above. Would it > at all be beneficial to use ztdummy as a clock source instead of the PRI? > What would normally be preferred? > > Certain pre-recorded messages, notably those of meetme rooms, sound absolutely > TERRIBLE on telephones, yet, MOH, and voicemail prompts for example, sounds > absolutely perfect. I confirmed and checked, all files being used are the > same format, and same encoding. I fail to see why one recording would play > absolutely flawlessly, whilst another would sound so terrible? > > I would appreciate it if more educated members can possibly engage in a > discussion surrounding these issues to hopefully resolve them. I've worked > with Asterisk before, but this is my first 'major' implementation in terms > of a PRI trunk, as well as the number of extensions involved. > > Any configuration files required would be happily provided. I thank you > for your time, and effort, and I look forward to hearing from you.
Asterisk version - gcc version - are prompts in GSM? Don't move away from PRI timing. What results do you get from zttest? -- Kind Regards, Matt Riddell Director _______________________________________________ http://www.venturevoip.com (Great new VoIP end to end solution) http://www.venturevoip.com/news.php (Daily Asterisk News - html) http://www.venturevoip.com/newrssfeed.php (Daily Asterisk News - rss) _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
