Commit Graph

36 Commits

Author SHA1 Message Date
Holger Hans Peter Freyther 6f039c158d sip: Mark call as MT call in preparation for incoming calls 2016-03-26 19:03:04 +01:00
Holger Hans Peter Freyther b927a0bbde call: It is call_create and not sip_create
It is not creating anything related to sip at all. Remove the
prefix in preparation to creating a call from a sip_call_leg.
2016-03-26 18:52:22 +01:00
Holger Hans Peter Freyther 989bef0875 app: Translate payload name to IETF codec name
Convert the MNCC codec type to the IETF codec name.
2016-03-26 16:33:15 +01:00
Holger Hans Peter Freyther f9ba5612a9 Write down some of the limitations of the current setup 2016-03-26 16:31:00 +01:00
Holger Hans Peter Freyther 997d72e0fe app: Ask the sip side to create a leg
Create SIP leg and if it is failing release the call
2016-03-26 06:22:07 +01:00
Holger Hans Peter Freyther 2211c3ba56 sip: Implement MT call out to SIP
* Create a new handle
* Send the invite
* Have some state transitions
* Allow to release a call in initial unconfirmed state, confirmed
one with cancel and connected with bye
* Add simple SDP parsing to find the rtpmap/codec that is used by
2016-03-26 06:22:06 +01:00
Holger Hans Peter Freyther 2e36090fea sip: Tell sofia-sip that we will ack certain things ourselves
This has not tested re-transmission and if a call is connected
multiple times or not.
2016-03-26 06:22:06 +01:00
Holger Hans Peter Freyther 71fbe870d8 mncc: In case of a disconnect.ind inform the other leg
In case the call got disconnected propagate it to the other leg
of the call.
2016-03-26 06:22:06 +01:00
Holger Hans Peter Freyther d3d8348c62 mncc: Send RTP_CONNECT and verify connect result
The current code can not deal with two outstanding commands. Let's
assume the user will hang up if the voice connection will fail and
we will add a general RTP_CONNECT check to tearn down a call.
2016-03-26 06:22:06 +01:00
Holger Hans Peter Freyther ad6eabd4b5 mncc: Refactor and reduce some code clones for sanity checks
Not every message might have the size of gsm_mncc and the size check
is done inside each routine. Routines that relate to calls now share
the code to check the size and the look-up to find the leg.
2016-03-26 06:22:06 +01:00
Holger Hans Peter Freyther 49a4a643da mncc: Prepare alerting and and connecting the call
What is not done is to actually set-up rtp that it can flow to the
now confirmed remote.
2016-03-26 06:22:06 +01:00
Holger Hans Peter Freyther 4ca311e629 mncc: Handle disconnect and release the call
Send a release request and release the leg on conformation
2016-03-26 06:22:06 +01:00
Holger Hans Peter Freyther cacce82810 mncc: In case of an unexpected REL.IND inform the other leg about it
I had modified my code to do nothing after having sent the PROCEEDING
message. First the MS will issue a DISCONNECT.IND (which I ignored) and
then there will be REL.IND. Let's inform the other leg about this event
and let's assume the call will then be terminated.
2016-03-26 06:22:06 +01:00
Holger Hans Peter Freyther aab9ac5191 mncc: Log commands in hex to find the name more easily in mncc_protocol.h
In the long run we should print these by name and not by the number
but as the table is in OpenBSC and I did not want to copy it we will
have to cope with the numbers a little longer.
2016-03-26 06:22:06 +01:00
Holger Hans Peter Freyther f86979e1eb call/mncc: Set proceeding and deal with release based on this state
Let's inform the MS that we have collected everything to move forward
with the call. A new way to release the call is required in this state.
2016-03-26 06:22:06 +01:00
Holger Hans Peter Freyther 292e2cddd0 mncc: Extract the RTP port information before continuing
These need to be used by the SIP leg to move forward.
2016-03-26 06:22:06 +01:00
Holger Hans Peter Freyther 153ebbf6e2 call: Change to past tense and move code after the free
Reading the "releasing" log output sounded like one more message
had been sent and this code is waiting for something. Take a copy
of the call id and then print that the call has been released.
2016-03-26 06:22:06 +01:00
Holger Hans Peter Freyther aa41b0aafc call: Re-order includes from local to osmocom to system
Let's follow the self first, local next, osmocom, system order of
include files.
2016-03-26 06:22:06 +01:00
Holger Hans Peter Freyther e08887ec4e app: Release the call by releasing the initial request
This will then go through the release procedure of the relevant
call instead of letting it timeout on the initial leg.
2016-03-26 06:11:09 +01:00
Holger Hans Peter Freyther 4f8cafa5b0 call: Continue up to the point of call routing
We accept the call on MNCC and ask the core to select/create the
second leg of the call.
2016-03-23 17:41:23 +01:00
Holger Hans Peter Freyther bc4fed27e1 mncc: Add a timeout when issuing a MNCC command 2016-03-23 17:08:03 +01:00
Holger Hans Peter Freyther a0aa566ec4 mncc: Remember the IMSI as well 2016-03-23 17:07:00 +01:00
Holger Hans Peter Freyther dbe55c1eb5 mncc: Add logging messages about the leg on all points
With a bit more code the logging will print:

<0001> mncc.c:233 Created call(5001) with MNCC leg(2147483659) IMSI(274018000000001)
<0001> mncc.c:178 RTP set-up continuing with call with leg(2147483659)
<0001> mncc.c:65 Got response, stopping timer on leg(2147483659)
<0002> call.c:51 call(5001) releasing.

Use %zu for size_t arguments, e.g. returned from sizeof.
2016-03-23 17:05:16 +01:00
Holger Hans Peter Freyther 239a122842 doc: Update with some requirements and limitations 2016-03-23 17:02:32 +01:00
Holger Hans Peter Freyther c4d01f9a90 call: Add a backpointer from leg to call and drop the argument
Simplify the structure by either working with a call or just
a leg of it. No need to carry both pointers all the time.
2016-03-22 21:04:56 +01:00
Holger Hans Peter Freyther 29b556490f mncc: Dispatch setup and issue rtp create in response then continue
The code is not tested and might be broken. Parse the setup request
of a MO call, create a new "call" with a MNCC leg and then issue the
call to create a RTP socket. Once this has been done, release the call
as the code to open a second leg has not been written yet.
2016-03-22 21:04:56 +01:00
Holger Hans Peter Freyther 90e7139691 mncc: Handle the hello message from NITB
Make a simple version comparison and close the socket in case of a
version mismatch. Begin to dispatch messages coming from the NITB
and log (all) unhandled messages.
2016-03-22 21:04:56 +01:00
Holger Hans Peter Freyther 45f0fa09d2 call/app: Hook the MNCC disconnect event in the app and release calls
In case the MNCC server is crashing we need to release all calls,
use the event emitted by the MNCC connection and iterate over all
calls and call the release function.
2016-03-22 16:32:48 +01:00
Holger Hans Peter Freyther 10e22bd6f4 call: Introduce a structure for representing a call
Right now a call has two legs, the initial one and the remote. In
general this will allow a SIP to SIP, SIP to MNCC and MNCC to MNCC
structure in the future.
2016-03-22 16:32:48 +01:00
Holger Hans Peter Freyther 90881b6a5a sip: Introduce source file to setup sofia sip
This code is capable of creating an agent that will bind on the
configured local address. The next steps are to configure the
library in terms of allowed features and prepare call handling.
2016-03-22 16:32:48 +01:00
Holger Hans Peter Freyther 9d12a7c34c mncc: Add code to manage the mncc connection for CC
Connect, re-connect and read messages from the MNCC socket. Dispatch
the event in case the system got disconnected.

Move the app definition to app.h and use it everywhere. Begin with a
new call for mncc.
2016-03-21 17:00:02 +01:00
Holger Hans Peter Freyther 80095748f9 mncc: Add the protocol description from OpenBSC 2016-03-21 15:46:53 +01:00
Holger Hans Peter Freyther 11713d88e4 vty: Work on configuration of the MNCC to SIP gateway
We will add addressing by IMSI but right now let's focus on the
minimum of what needs to be there.
2016-03-21 15:39:41 +01:00
Holger Hans Peter Freyther 5b0d4618df telnet: Use the dynamic interface for binding the VTY
This way one can bind the interface to another ip address.
2016-03-21 11:48:02 +01:00
Holger Hans Peter Freyther c1879e47ba logging: Define default logging categories 2016-03-21 11:47:25 +01:00
Holger Hans Peter Freyther a1909e6c80 Initial commit for a MNCC to SIP gateway (and maybe auth GW too)
* It is written in C and using libosmovty and other data structures
* It is using sofia-sip for the SIP handling as a good library for
such a task
* It is using glib for the sofia-sip event loop integration. In the
future we can write our own root context but right now that looks
like a necessary evil. No glib usage is allowed in this code and
only sofia-glib is linked.
2016-03-21 09:54:37 +01:00