asterisk users - Dec 2005 - Experience sharing on Planet VIP-450 + Asterisk

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> 
> Hi all,
>    Previously I have asked about stopping iLBC in Asterisk, and I
would
> like to use G.711 u-law only. Actually I have tried entirely remove
> anything file related to "ilbc" in /usr/lib/asterisk/modules, but
it
still
> didn't work. The error message about the improper RTP packet length
still
> there, and I still can't make DTMF detection work.
>    What's next? Well... thanks to the buggy firmware and imcompatable
> standard with Asterisk...
> 
>    First of all, I can't deny that Planet VIP-450 does a good job in
> packetizing voice stream, the voice quality is really good and delay
is
> really small. Also the hardware itself is quite robust, it seldom
halt..
> (the machine has been up for a few days). Also it is quite
feature-rich, I
> can say. BUT I think there is quite a number of BUGS in the firmware!
> 
>    In order to see which kind of DTMF Relay it is using, I have done a
> packet analysing. When I try to pass SIP INFO type DTMF band to
VIP-450,
> it replies "501 Unimplemented". Also when I try to pass DTMF from
my
POTS
> phone via the FXO port, only RTP payload can be seen in the packet
> captures. I DID suspect that it is RFC2833, because as far as I know
> RFC2833 did have the DTMF textx inside the RTP packet somewhere (seems
> header). But asterisk just simply did not regconize them (of coz I
have
> set DTMFmode=rfc2833)! It is pretty strange that the user manual
states
> "VIP handles DTMF Relay per SIP specification". So VIP-450
actually is
> using what kind of SIP specification?
> 
>   How about using its Inband DTMF relay? This will certainly generate
> strange warning just like my case : improper ilbc frame size and tell
me
> to use u-law to do DTMF even if I AM using G.711 u-law. It is seems
that
> the DTMF tone generated by VIP-450 generate is kinda strange...
> 
>   So the final solution is, SIMPLY SWITCH OFF THE DTMF RELAY IN
VIP-450.
> Please try to type "show coding" in console mode and you will see
a
lot of
> coding (codec) profiles. Most of them are with DTMF relay. Just switch
off
> them by "set coding <profile id> dtmf_relay off" (please
check with
the
> manual). If you want to stop certain codec, just simply make that
coding
> profile unusable in voice. For example, "set coding <profile id>
voice
> off". If you only turn on the profile with u-law, the SIP header it
issues
> will just consist of 0x4 (ulaw) codec, not 0x105.
> 
>   In my point of view, Planet is expecting this device is connected to
> another VIP-450, not really for Asterisk or anything else, even not
for a
> soft phone. Certainly this is not enough for everyone, at least I
can't do
> any IVR and something what a PBX should have (just like what I can do
in
> Asterisk). I hope my experience will help anyone who is using VIP-450
with
> Asterisk, just like me. I have done Googling for 3 days but I can
search
> for nothing related to this issue. Sorry for my poor written English.
> 
> Cheers,
> Jason Chan, Hong Kong
You should post this stuff and future findings on the wiki.

Thanks,
Steve

Jason Chan (jasonOfficial) wrote:
> What's next? Well... thanks to the buggy firmware and imcompatable
> standard with Asterisk...
> First of all, I can't deny that Planet VIP-450 does a good job in
> packetizing voice stream, the voice quality is really good and delay
> is really small. Also the hardware itself is quite robust, it seldom
> halt.. (the machine has been up for a few days). Also it is quite
> feature-rich, I can say. BUT I think there is quite a number of BUGS
> in the firmware!
> In order to see which kind of DTMF Relay it is using, I have done a
> packet analysing. When I try to pass SIP INFO type DTMF band to
> VIP-450, it replies "501 Unimplemented". Also when I try to pass
DTMF
> from my POTS phone via the FXO port, only RTP payload can be seen in
> the packet captures. I DID suspect that it is RFC2833, because as far
> as I know RFC2833 did have the DTMF textx inside the RTP packet
> somewhere (seems header). But asterisk just simply did not regconize
> them (of coz I have set DTMFmode=rfc2833)! It is pretty strange that
> the user manual states "VIP handles DTMF Relay per SIP
specification".
> So VIP-450 actually is using what kind of SIP specification?
Sounds familiar.See below.
> How about using its Inband DTMF relay? This will certainly generate
> strange warning just like my case : improper ilbc frame size and tell
> me to use u-law to do DTMF even if I AM using G.711 u-law. It is seems
> that the DTMF tone generated by VIP-450 generate is kinda strange...
> So the final solution is, SIMPLY SWITCH OFF THE DTMF RELAY IN VIP-450.
> Please try to type "show coding" in console mode and you will see
a
> lot of coding (codec) profiles. Most of them are with DTMF relay. Just
> switch off them by "set coding <profile id> dtmf_relay off"
(please
> check with the manual). If you want to stop certain codec, just simply
> make that coding profile unusable in voice. For example, "set coding
> <profile id> voice off". If youonly turn on the profile
withu-law, the
> SIP header it issues will just consist of 0x4 (ulaw) codec, not 0x105.
This is what got my attention.Take a look at the commands that I use for
the Yoda VG-400. If I'm not mistaken, they're exactly the same for the
Planet.Same firmware libraries I presume.
http://lists.digium.com/pipermail/asterisk-users/2005-August/120588.html
If you notice, I also set dtmf_relay off.Too bad you didn't post any
commands earlier, you would have saved a lot of time.

Looks like we should compare notes.
> In mypoint of view, Planet isexpectingthis deviceisconnected to
> another VIP-450, not really for Asterisk or anything else, even not
> fora soft phone. Certainly this is not enough for everyone, at leastI
> can't do any IVR and something what a PBX should have (just like what
> I can do in Asterisk). I hope my experience will help anyone who is
> using VIP-450 with Asterisk, just like me. I have done Googling for 3
> days but I can search for nothing related to this issue. Sorry for my
> poor written English.
> Cheers,
> Jason Chan, Hong Kong
This is exactly what Yoda wants as well. I remember planning to buy a
Planet unit during my love-hate relationship with Yoda and Asterisk but
I'm now glad I didn't. It seems I would have had to tackle the same
problems. I'm just happy the units I have work well. Thanks to Yoda's
support. They're set on GnuGK rather than Asterisk so it was a first for
me as well as them.


Xie Xie

-- 
JP Carballo

http://www.netfone2x.com
Bringing the world closer.

It might look like I'm doing nothing, but at the cellular level, I'm
really quite busy.

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