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Bug #3310

closed

Voice call always failed with Nokia 1600

Added by timojacobus almost 6 years ago. Updated over 5 years ago.

Status:
Resolved
Priority:
Low
Assignee:
roh
Category:
osmo-bts-trx
Target version:
-
Start date:
05/31/2018
Due date:
% Done:

100%

Spec Reference:

Description

Hi, I wasnt to report bug with our old Nokia 1600 mobile phones.

Problem: Incoming, outgoing call always failed if one of phones is Nokia 1600.

Detailed informations:
  • Calling from Nokia 1600 (extension 23855) to Google Nexus 5 (extension 23119)
  • Call fails after 30-45 seconds (seems like dropped by Nokia), Nokia without gsm signal.
  • PCAPs with RSL+OML and with gsmtap included
  • log files included
  • BTS+BSC configs included

We noticed that calls with Nokia will always fail after 30-45 seconds. Both outgoing and incoming calls. In RSL, there is CC Connect ACK, no CC Disconect or CC Release. When a call fails, then after some time the connection failure occurs.
At the beginning of call, voice is clear, about 10 seconds before drop is voice corrupted and then call fails.

Before call failed, there are many of entries of this type in log - "Received bad TCH frame ending at fn=619067 for TCH/F". We tried also same RX gain/TX atten. modifications, also MS power settings, but with no effect.

With another different phones, calls work perfectly, so we suspecting the undefined behaviour of Nokia 1600 (https://www.gsmarena.com/nokia_1600-1188.php)

Tests:
1. call accepted, call failed
2. call accepted, call failed (longer pcap with connection failure)
3. only alerting, call failed

HW:
Ettus B200 with external clock
Nokia 1600 (tried several phones same type)
LG Nexus 5

SW:
UHD_003.009.006-0-g122d5f8e
gnuradio 3.7.11

libosmocore 0.9.6
  libosmo-abis 0.3.3
  libosmo-netif 0.0.7
osmo-trx 0.1.9
  osmo-bts 0.5.0
  OpenBSC version 0.15.0.788-271ce

Also tried with latest versions, but with same results
UHD_3.12.0.git-159-g9cf1a8e9
gnuradio 3.7.12

libosmocore 0.11.0
  libosmo-abis 0.5.0
  libosmo-netif 0.2.0
osmo-trx 0.4.0
  osmo-bts 0.8.0
  OpenBSC version 1.1.0

Files

log_1.txt log_1.txt 2.82 MB timojacobus, 05/31/2018 12:52 PM
log_2.txt log_2.txt 2.75 MB timojacobus, 05/31/2018 12:52 PM
log_3.txt log_3.txt 2.4 MB timojacobus, 05/31/2018 12:52 PM
pcap_1_clean.pcapng pcap_1_clean.pcapng 214 KB timojacobus, 05/31/2018 12:52 PM
pcap_2_clean.pcapng pcap_2_clean.pcapng 143 KB timojacobus, 05/31/2018 12:52 PM
pcap_3_clean.pcapng pcap_3_clean.pcapng 132 KB timojacobus, 05/31/2018 12:52 PM
osmo-bts.cfg osmo-bts.cfg 1.27 KB timojacobus, 05/31/2018 12:52 PM
openbsc.cfg openbsc.cfg 1.6 KB timojacobus, 05/31/2018 12:52 PM
bsc.hlr bsc.hlr 27 KB timojacobus, 05/31/2018 12:52 PM
osmo-trx.cfg osmo-trx.cfg 357 Bytes timojacobus, 07/11/2018 08:34 AM
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