james.wilson Posted March 2, 2011 Posted March 2, 2011 We have systems running on talktalk fine. However you cant use the old style dtmf digi mode. Your system should (if relativly modern) be caperble of 'extended formats' We use SIA 3 and found this to solve 'most' but not all issues. As noted above its because talk talk have their own 21CN IP core and its designed for voice, not old style alarm communicators securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount.
jimcarter Posted March 2, 2011 Posted March 2, 2011 I guess some of you may have found this before, but some modems have "training" issues with Carrier Pre Selection. That is if an "old" BT line is being re-routed via another provider latency is added into the call (that's a little bit of delay in non-comms speak). So....the modem at the protected premises attempts to make a call, but latency means that it does not properly connect with the modem at the receiving end and the call fails. One way is to force the modem to use BT (prefix with 1280), however I do believe I read that on certain exchanges this is no longer availble..someone may be able to confirm? I agree that all PSTN circuits are actually digitised at the exchange and are then routed via the fibre backbone which in the UK is mainly ATM, but migrating to IP. However this should not be the cause of the problem. With regards to the reliability, well all communications of voice and data are routed over the same core network, so the reliability of all mediums are the same. Individual locations may suffer as a result of distance from the exchange, the quality of the copper/infrastructure of the last mile etc. but the core network is very, very reliable for all traffic (PSTN/ADSL/ISDN etc). Jim Carter WebWayOne Ltd www.webwayone.co.uk
IPAlarms Posted March 3, 2011 Posted March 3, 2011 However, I would gracefully ask you to read back your posts Steve as they are coming across as scaremongering Just passing on my knowledge of what is now the biggest single problem in North America and has been for some time. They are a few years ahead of the UK as far as VoIP is concerned, so take it or leave it. Free Alarm Monitoring over the Internet from IP Alarms
kwc Posted March 3, 2011 Posted March 3, 2011 As Jim Above, One way is to force the modem to use BT (prefix with 1280). When i worked for ADT this was the way to solve this problem. May have changed now but we prefix the 2nd number on the any digi just to help.
sixwheeledbeast Posted March 3, 2011 Posted March 3, 2011 As Jim Above, One way is to force the modem to use BT (prefix with 1280). When i worked for ADT this was the way to solve this problem. May have changed now but we prefix the 2nd number on the any digi just to help. BT have change there policies on the 1280 prefix see here:- http://btsupport.custhelp.com/app/answers/list/c/1895 On the new service, a call pre-fixed with 1280 will connect in the normal way, but it will NOT be chargeable to a BT bill. It will actually be charged by your own Call Provider (and this could be at a higher rate). It will also NOT count towards the necessary calls quota to receive either BT Caller Display or BT Answer 1571 at no extra cost.
james.wilson Posted March 3, 2011 Posted March 3, 2011 Just passing on my knowledge of what is now the biggest single problem in North America and has been for some time. They are a few years ahead of the UK as far as VoIP is concerned, so take it or leave it. Steve id agree with techguy, your posts do read wrong sometimes, especially the end of the above securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount.
Michael Boty Posted June 19, 2011 Posted June 19, 2011 More information on signalling needed to resolve. Digicom - levels ? call getting through, acknolegment being recieved but not clearing digicom. I.P. ???
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