35c3 feedback

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Keith keith at rhizomatica.org
Wed Jan 2 12:11:14 UTC 2019


Hi all.

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. This would have
been trivial to patch had we known, and it prompts me to think this
should probably be implemented as a runtime config option in sip section
'tonintl prefix' or some such? It would seem correct for it to be
restricted to the set of either '00' or '+', no other options really
makes sense, not even "no prefix". right?


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.

So I thought I'd note it down here. 

k/









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