Reply to: VOIP Security

[DGK]

You have to ask? Post your bank details here or quit trolling...

Cliphead was obviously clueless. Thanks to all who contributed. There are some clever chaps on here. not like the old 'paper-MCSE Mordac days.

[Churchill]

I thought it was the little blip tone to tell the person on hold they were lucky to not be hearing some godawful version of greensleaves

That's because I his heducated and you hisn't.

[Churchill]

Nah, it's filler when otherwise there would be no sound between words, people are so enured to copper wire you see. If you're lucky it's just low level white noise.

Or if you do it properly it's a function of the previously sent RTP packets...

[threaded]

I thought it was the little blip tone to tell the person on hold they were lucky to not be hearing some godawful version of greensleaves

Nah, it's filler when otherwise there would be no sound between words, people are so enured to copper wire you see. If you're lucky it's just low level white noise.

[Lucy]

That's like the attract sequence on a fruit machine. Lets the bar staff know that no one has stolen it.

I thought it was the little blip tone to tell the person on hold they were lucky to not be hearing some godawful version of greensleaves

[threaded]

Now tell him about "Comfort Noise"...

That's like the attract sequence on a fruit machine. Lets the bar staff know that no one has stolen it.

[DodgyAgent]

EnCOder/DECoder - CODEC. Simply analog to digital conversion, and back again. Different ones compress at different rates - with resulting differential in packet size. Ties in to voice quality somewhat as well. Fine tuned to fit in with our perceptible audio range.

Then there's video codecs/ stuff for fax etc which has different requirements - but we're talking specifically voice ones, so mainly down to how big the pack size is, versus voice quality etc.

That help?

It certainly does, thank you snaw

[snaw]

Now tell him about "Comfort Noise"...

Nah, your turn.

Starts getting all twisty for me as soon as you get into all that VOIP tuning stuff: input gain, output attenuation and impedance ... makes my brain hurt.

[Churchill]

EnCOder/DECoder - CODEC. Simply analog to digital conversion, and back again. Different ones compress at different rates - with resulting differential in packet size. Ties in to voice quality somewhat as well. Fine tuned to fit in with our perceptible audio range.

Then there's video codecs/ stuff for fax etc which has different requirements - but we're talking specifically voice ones, so mainly down to how big the pack size is, versus voice quality etc.

That help?

Now tell him about "Comfort Noise"...

[snaw]

What is a codec?

DA in "trying to learn" mode

EnCOder/DECoder - CODEC. Simply analog to digital conversion, and back again. Different ones compress at different rates - with resulting differential in packet size. Ties in to voice quality somewhat as well. Fine tuned to fit in with our perceptible audio range.

Then there's video codecs/ stuff for fax etc which has different requirements - but we're talking specifically voice ones, so mainly down to how big the pack size is, versus voice quality etc.

That help?

[Jog On]

Could there be an issue of access to the company phone book and social engineering attack implications?

[Kinvara]

Mitel!!!

[DodgyAgent]

Nah, just messing with you.

Guess it's all about perspective. You're a developer and clearly see it through those eyes - I'm coming at it from the infrastructure side and have a slightly different slant.

For me the biggest security risk is the access to the physical port part, or packet capture/call replay not injecting audio into a SIP conversation - btw don't recall him specifically mentioning SIP, as opposed to say MGCP etc - same with CODEC, he's talking about password on the phone, the CODEC isn't really that big a deal vis-a-vis VOIP security.

Not being antagonistic, just bored and picking a few holes in your statements. Plus happen to be doing a fair bit of VOIP at the moment so it's kind of topical for me.

What is a codec?

DA in "trying to learn" mode

[Moscow Mule]

Mods! Mods!

On the basis that I haven't got a Scooby Do what these two are on about - can this be moved to Technical please...

[Churchill]

Nah, just messing with you.

Guess it's all about perspective. You're a developer and clearly see it through those eyes - I'm coming at it from the infrastructure side and have a slightly different slant.

For me the biggest security risk is the access to the physical port part, or packet capture/call replay not injecting audio into a SIP conversation - btw don't recall him specifically mentioning SIP, as opposed to say MGCP etc - same with CODEC, he's talking about password on the phone, the CODEC isn't really that big a deal vis-a-vis VOIP security.

Not being antagonistic, just bored and picking a few holes in your statements. Plus happen to be doing a fair bit of VOIP at the moment so it's kind of topical for me.

Holes?

How very dare you.