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Some RTP endpoints may not check for bad frame indications, so a frame
that is marked as bad may be still forwarded, which creates anoying noise.
This patch drops these frames. It depends on the other RTP endpoint how
dropped frames are handled. (insert silence, extrapolate speech...)
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When reading from RTP socket, the first read() may fail right after
connecting to remote socket. Subsequent read() will work as it should.
If the remote socket does not open fast enough, the transmitted RTP
payload can cause an ICMP (connection refused) packet reply. This causes
the read to fail with errno=111. In all other error cases, the errno is
logged at debug level. In all error cases, reading is not disabled.
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After OpenBSC stalled for some reason (e.g. CPU overload or database
access) or after speech frames have been lost (MNCC application problems /
hold/retrieve call), the timestamp and the sequence number of the RTP
socket state must be corrected. The amount of incrmentation is calculated
from the elapsed time. Not incrementing timestamp and sequence number would
cause all frames to be dropped by ipaccess BTS, because the BTS expects
frames with more recent timestamps.
If speech frames are received too fast, they must be dropped. The timestamp
and sequence number of the RTP socket state are not changed in this case.
Incmenetating timestamp and sequence number would causes high delay at
ipaccess BTS, because the BTS would queue the frames until the timestamp
matches the current time.
There is a simple test case:
Make a call between two phones and check the delay. (When using LCR, make
a call to the echo test.) The press CTRL+z to suspend OpenBSC process for
a few seconds and enter "fg" to continue OpenBSC process. There shall be no
change in the delay, even after repeating this test many times.
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Since EFR/AMR/HR codecs use dynamic RTP payload, the payload type can
be set. If it is set, the frame type must be set also, so OpenBSC
knows what frame types are received via RTP.
This modification only affects traffic beween application and MNCC
interface, not the RTP traffic between OpenBSC and BTS.
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Instead of forwarding traffic through MNCC interface, traffic can
be forwarded to a given RTP peer directly. A special MNCC message
is used to control the peer's destination. The traffic can still be
forwarded through MNCC interface when this special MNCC message is
not used.
It also works with E1 based BTSs.
In conjunction with LCR's "rtp-bridge" feature, the RTP traffic
can be directly exchanged with a remote SIP endpoint, so that the
traffic is not forwarded by LCR itself. This way the performance
of handling traffic only depends on OpenBSC and the remote SIP
endpoint. Also the traffic is exchanged with the SIP endpoint
without transcoding, to have maximum performance.
Increment MNCC version to 5.
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If a bad TRAU frame is received, it is forwarded to MNCC application
as GSM_BAD_FRAME. The application can now handle the GAP of missing
audio. (e.g. by extrapolation)
If TRAU frames are forwarded via RTP, bad frames are dropped, but frame
counter and timestamp of RTP sender state is incremented.
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AMR rate is currently fixed to 5.9k.
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This patch fixes a corner case (padding 1, payload size incl padding
0) which is not being detected correctly.
Sponsored-by: On-Waves ehf
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Byte order defines have a DARWIN prefix on OSX so the values openbsc
expects are set from their Darwin counterparts when compiled on OSX.
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This is a big patch that ports openBSC over libosmo-abis.
Sorry, the changes that are included here are all dependent
of libosmo-abis, splitting them into smaller pieces would
leave the repository in some intermediate state, which is
not desired.
The main changes are:
- The directory libabis/ has been removed as it now lives in
libosmo-abis.
- new configuration file format for nanoBTS and HSL femto, we
need to define the virtual e1_line and attach it to the OML
link.
- all the existing BTS drivers (nanoBTS, hsl femto, Nokia site,
BS11 and rbs2000) now use the new libosmo-abis framework.
- use r232 input driver available in libosmo-abis for bs11_config.
- use ipa_msg_recv instead of old ipaccess_read_msg function.
- delete definition of gsm_e1_subslot and input_signal_data.
These structures now lives in libosmo-abis.
Most of this patch are deletions of libabis/ which has been
moved to libosmo-abis.
This patch also modifies openBSC to use all the new definitions
available in libosmocore and libosmo-abis. In order to do that,
we have replaced the following:
- DINP, DMI, DMIB and DMUX by their respective DL* correspondences.
- SS_GLOBAL by SS_L_GLOBAL
- SS_INPUT by SS_L_INPUT
- S_GLOBAL_SHUTDOWN by S_L_GLOBAL_SHUTDOWN
- SS_INPUT by SS_L_INPUT
- S_INP_* by S_L_INP_* sub-signals
- E1INP_NODE by L_E1INP_NODE vty node
This patch has been tested with:
- one nanoBTS
- the HSL femto with the examples available under libosmo-abis
- BS11 with both dahdi and misdn drivers.
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This should not introduce any functional changes, it just re-arranges
some definitions in the header file, and introduces the ROLE_BSC
define that we enable for the BSC-specific fields.
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Summary of changes:
s/struct bsc_fd/struct osmo_fd/g
s/bsc_register_fd/osmo_fd_register/g
s/bsc_unregister_fd/osmo_fd_unregister/g
s/bsc_select_main/osmo_select_main/g
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These are not needed any more. We used them for u_int
types but we now use uint which comes from stdint.h
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This was done with sed on the files.
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libosmogsm is a new library that is distributed in the libosmocore.
Now, openbsc depends on it. This patch gets openbsc with this
change.
This patch also rewrites all include path to the new
osmocom/[gsm|core]
Signed-off-by: Pablo Neira Ayuso <pablo@gnumonks.org>
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... and make sure tests work again after restructuring
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