Spark buys 26% of NOW

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raytaylor

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#1439654 3-Dec-2015 01:56

old3eyes: I hope that Spark can sort out Now's SIP trunk offering. Had another tech ring me today saying that they could not call a remote IVR from the new Now trunks that he had installed. Now is the only SIP carrier that we have tested that uses Inband rather than RFC2833 for DTMF signaling.

I believe that was because now run many analog monitored alarm dialers over their network. I think its really impressive - though you may have found a side effect. There was a post on geekzone ~5 years ago about how someone was able to get 28k dialup to work via one of their sip trunks.

Ray Taylor

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raytaylor

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#1439655 3-Dec-2015 01:59

Athlonite:

Didn't Now buy out and existing HB ISP

You could be thinking of when Airnet changed their name to Now when they switched to primarily being a fixed line provider.

Ray Taylor

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old3eyes

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#1439675 3-Dec-2015 07:31

raytaylor:
old3eyes: I hope that Spark can sort out Now's SIP trunk offering. Had another tech ring me today saying that they could not call a remote IVR from the new Now trunks that he had installed. Now is the only SIP carrier that we have tested that uses Inband rather than RFC2833 for DTMF signaling.

I believe that was because now run many analog monitored alarm dialers over their network. I think its really impressive - though you may have found a side effect. There was a post on geekzone ~5 years ago about how someone was able to get 28k dialup to work via one of their sip trunks.

Maybe . But we can get dialup to work in Sparks GVC which use RFC..

Regards,

Old3eyes

sbiddle

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#1439690 3-Dec-2015 08:20

raytaylor:
old3eyes: I hope that Spark can sort out Now's SIP trunk offering. Had another tech ring me today saying that they could not call a remote IVR from the new Now trunks that he had installed. Now is the only SIP carrier that we have tested that uses Inband rather than RFC2833 for DTMF signaling.

I believe that was because now run many analog monitored alarm dialers over their network. I think its really impressive - though you may have found a side effect. There was a post on geekzone ~5 years ago about how someone was able to get 28k dialup to work via one of their sip trunks.

Dialup and DTMF are two very different things. It is very unusual to only support inband as RFC2833 is the standard for DTMF in the SIP world. Inband is supported in addition by many SIP providers, but it's incredibly rare for this to be the only supported method due to the inaccuracy that can result, and the fact it limits codec usage as you can only use uncompressed PCM codecs.

Data becomes interesting, because alaw and ulaw used for VoIP are essentially no different to the 64k PCM channels that are used in the ISDN world. There is nothing to prevent data use over an alaw or ulaw connection, but digital processing features such as jitter buffers and echo cancellation which are the norm on most ATA's play havoc with a modem, particularly as the speed goes up. EFTPOS at 9600 will work fine over VoIP.

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