Re: [Freeswitch-users] echo cancellation on PRI cards

Fadil Berisha wrote: > > Sure you can get reliable DTMF detection on 70%-80% of call paths with > no echo cancellation, > > > Fair enough. You say "sure you can get reliable DTMF detection on > 70%-80% of call paths with no echo cancellation". OK, you forgot to > mention that this is ach

Re: [Freeswitch-users] echo cancellation on PRI cards

> Sure you can get reliable DTMF detection on 70%-80% of call paths with > no echo cancellation, Fair enough. You say "sure you can get reliable DTMF detection on 70%-80% of call paths with no echo cancellation". OK, you forgot to mention that this is achievable with text-book algorithms and tha

Re: [Freeswitch-users] echo cancellation on PRI cards

Fadil Berisha wrote: > > That's a simplification. Simple IVR (record, replay, collect > DTMF) probably > doesn't need EC; > > > > Dave > > Collect DTMF does not need EC. I take out your word "probably" > because no need for any dilemma. Interaction between DTMF detector an > EC *whe

Re: [Freeswitch-users] echo cancellation on PRI cards

> That's a simplification. Simple IVR (record, replay, collect DTMF) > probably > doesn't need EC; > Dave Collect DTMF does not need EC. I take out your word "probably" because no need for any dilemma. Interaction between DTMF detector an EC *when EC exist * is different question and deserve s

Re: [Freeswitch-users] echo cancellation on PRI cards

Well, >From my experience, an AS5300 thinks nearly *anthing* is dtmf. The one I have as a PSTN onramp to our conference bridge drives me bonkers with false positives since every key on the pad means something in our default conference. Jim Dixon designed the el-cheapo (tormenta 2) to put as many

Re: [Freeswitch-users] echo cancellation on PRI cards

Raymond Chandler wrote: > What's interesting to me is everyone on this thread except you has > said that in real-world scenarios, they need the EC for reliability. > One of which, does signal processing programming professionally. It > seems to me that if you "build a better mouse trap" you

Re: [Freeswitch-users] echo cancellation on PRI cards

David Knell wrote: > Hi Arnaldo, > > That's interesting - Brasil was my first proper IVR installation: one > with Embratel in Sao Paulo, and then a couple with TeleRJ. I remember > landing at Sao Paulo airport for the first time at 7 a.m. with > instructions to "meet a fat man called Ferrari" u

Re: [Freeswitch-users] echo cancellation on PRI cards

OK, one last go and I give up. Lets look at the documentation for Dialogic springware. This is the DSP package that loads in their cards or runs on the host in HMP applications. It does things like DTMF generation and detection for all Dialogic cards except the DM3 series. The documentation say

Re: [Freeswitch-users] echo cancellation on PRI cards

Hi Arnaldo, That's interesting - Brasil was my first proper IVR installation: one with Embratel in Sao Paulo, and then a couple with TeleRJ. I remember landing at Sao Paulo airport for the first time at 7 a.m. with instructions to "meet a fat man called Ferrari" unsure as to whether I was in

Re: [Freeswitch-users] echo cancellation on PRI cards

To share my experience: I had issues with echo with many E1 trunks in Serbia, especially when voice in between telco's network went to well known bad analog lines. I used OSLEC and I was fortunate to have Steve to complain to, he helped patching it further after my beta testing. Not many people wou

Re: [Freeswitch-users] echo cancellation on PRI cards

Sharing my humble experience: in Brazil we usually need echo cancellation to have reliable DTMF detection _and_ voice quality over E1 lines (be it on MFC/R2 - r2d - or ISDN PRI lines), either for sip/tdm gateway devices or IVR applications. Usually there's no need for echo cancellation on links fr

Re: [Freeswitch-users] echo cancellation on PRI cards

Steve Underwood wrote: David Knell wrote: Steve Underwood wrote: [whopping big snip] The first bit of that's a tad patronising, isn't it, You are the one who started out being offensive. I'm sorry if you find disagreement offensive; you might not wish

Re: [Freeswitch-users] echo cancellation on PRI cards

David Knell wrote: > Steve Underwood wrote: >> [whopping big snip] >> >>> The first bit of that's a tad patronising, isn't it, >>> >> You are the one who started out being offensive. >> > I'm sorry if you find disagreement offensive; you might not wish to > read beyond this > point if s

Re: [Freeswitch-users] echo cancellation on PRI cards

> I'm afraid that your original bald claim - that "IVRs badly need echo > cancellation" is simply > wrong, misleading and irresponsible: those believing it will end up spending > large sums > of money on technology which they probably do not need. Anybody with years, perhaps decades, of DSP progra

Re: [Freeswitch-users] echo cancellation on PRI cards

Steve Underwood wrote: [whopping big snip] The first bit of that's a tad patronising, isn't it, You are the one who started out being offensive. I'm sorry if you find disagreement offensive; you might not wish to read beyond this point if so. and, in the case of the decade-old Acu

Re: [Freeswitch-users] echo cancellation on PRI cards

David Knell wrote: > Steve Underwood wrote: >> David Knell wrote: >> >>> Steve Underwood wrote: >>> > When there is Echo being generated from the far end, usually in a > bridged call. If you application is just an IVR, with no far end > connectivity, then you shouldn't need an

Re: [Freeswitch-users] echo cancellation on PRI cards

Steve Underwood wrote: David Knell wrote: Steve Underwood wrote: When there is Echo being generated from the far end, usually in a bridged call. If you application is just an IVR, with no far end connectivity, then you shouldn't need an echo can. If you are bridging calls, then at som

Re: [Freeswitch-users] echo cancellation on PRI cards

Anthony Knight wrote: > Thanks for the feedback. > > I have plenty of experience with IVRs and Dialogic cards (starting > with D121/LSI120s and SS96s under DOS in the 90's all the way up to > Intel's DM/Vs) and didn't ever have a problem with DTMF collection > with ISDN PRI lines except occasi

Re: [Freeswitch-users] echo cancellation on PRI cards

Thanks for the feedback. I have plenty of experience with IVRs and Dialogic cards (starting with D121/LSI120s and SS96s under DOS in the 90's all the way up to Intel's DM/Vs) and didn't ever have a problem with DTMF collection with ISDN PRI lines except occasionally with wireless and cell phones (B

Re: [Freeswitch-users] echo cancellation on PRI cards

David Knell wrote: > Steve Underwood wrote: >>> When there is Echo being generated from the far end, usually in a >>> bridged call. If you application is just an IVR, with no far end >>> connectivity, then you shouldn't need an echo can. If you are bridging >>> calls, then at some point you may

Re: [Freeswitch-users] echo cancellation on PRI cards

Steve Underwood wrote: When there is Echo being generated from the far end, usually in a bridged call. If you application is just an IVR, with no far end connectivity, then you shouldn't need an echo can. If you are bridging calls, then at some point you may need it, depending on what else is

Re: [Freeswitch-users] echo cancellation on PRI cards

Wasim Baig wrote: > 2009/3/17 Anthony Knight > > > I'm thinking about doing a project that would use FreeSWITCH as an > IVR, with callers being routed in by both ISDN PRI, and also SIP > trunks, with occasional bridge calls between callers. > > I'm wonde

Re: [Freeswitch-users] echo cancellation on PRI cards

2009/3/17 Anthony Knight I'm thinking about doing a project that would use FreeSWITCH as an IVR, with > callers being routed in by both ISDN PRI, and also SIP trunks, with > occasional bridge calls between callers. > > I'm wondering in what use cases hardware echo cancellation on the PRI cards >

Re: [Freeswitch-users] echo cancellation on PRI cards

The cards that feature Hardware Echo Can¹s work on hardware/driver level and are supported... From: Anthony Knight Reply-To: Date: Tue, 17 Mar 2009 00:55:35 -0400 To: Subject: [Freeswitch-users] echo cancellation on PRI cards I'm thinking about doing a project that would use FreeSWIT

[Freeswitch-users] echo cancellation on PRI cards

I'm thinking about doing a project that would use FreeSWITCH as an IVR, with callers being routed in by both ISDN PRI, and also SIP trunks, with occasional bridge calls between callers. I'm wondering in what use cases hardware echo cancellation on the PRI cards is needed. And does hardware echo ca