35c3 feedback

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Sandi Suhendro djks74 at gmail.com
Wed Jan 2 13:13:17 UTC 2019


+ country code using osmo-sip-connector is fine with asterisk pbx for
osmocom stacks for me.

regards,
Sandi / DUO

On Wed, Jan 2, 2019, 19:47 Max <msuraev at sysmocom.de wrote:

> Hi.
>
> Thanks for write-up.
>
> Comments are inline below, here's another (unrelated) issue observed
> during 35c3: https://osmocom.org/issues/3741
>
> 02.01.19 13:11, Keith пишет:
> > 1) SIP Connector handling of TON GSM340_TYPE_INTERNATIONAL
> >
> > Apparently at least one person was frustrated at the congress by not
> > being able to call out using the numbers stored in their GSM handset
> > using the form +CountryCode.
> >
> > As we know this appears at Call Control with TON intl, which sip
> > connector then prefixes with '+' before sending to SIP
> >
> > The reason for lack of service at ccc was that the Yate pbx does not
> > support this number scheme and needed the 00 prefix.
>
> The *+12345... format is defined in **ITU-T E.123 so the lack of support
> for this format looks like a bug in Yate.*
>
> *What about 00 prefix? Unless it's defined in some spec, I don't think
> it make sense to introduce options just to work around bug in particular
> PBX.
> *
>
> > 2) 3G data instabilities
> >
> > ( Just a quick observation note, no pcap! )
> >
> > I happened to notice that pinging a 3G handset from the network side
> > (default ping: 1 sec internal, 64 ICMP bytes) keeps the connection
> > "alive" and using 3G data is then a pleasant experience, IM, email,
> > browsing, SIP call all working nicely. peak max download speed of 16Mbps
> > was reported at one time by m.speedof.me
> >
> > However, stopping the ping results in loss of data conex within a few
> > seconds, and the behaviour from users point of view is then strikingly
> > similar to what's observed on 2G; and I am more or less convinced has to
> > do with the unknown Timing Advance issues in the PCU.
>
> Is there bug for this already? If both 2G and 3G have similar issues in
> the absence of MT traffic than there might be something wrong in the
> core components (SGSN/GGSN?).
>
> --
> - Max Suraev <msuraev at sysmocom.de>       http://www.sysmocom.de/
> =======================================================================
> * sysmocom - systems for mobile communications GmbH
> * Alt-Moabit 93
> * 10559 Berlin, Germany
> * Sitz / Registered office: Berlin, HRB 134158 B
> * Geschaeftsfuehrer / Managing Directors: Harald Welte
>
>
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