2 Jan
2019
2 Jan
'19
12:46 p.m.
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(a)sysmocom.de> http://www.sysmocom.de/
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