OpenBSC with LCR/SIP

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Kelum Navaratne kelum.nava at gmail.com
Wed Jan 23 04:24:13 UTC 2013


Hi Every one,

Would the IP.Access nanoBTS works behind a NAT with OpenBSC ?

i.e. two BTSs in two different locations behind NAT connecting to NITB. im
trying to make a call, but it seems rtp has some problem.

rgds
Nava

On Tue, Oct 16, 2012 at 6:49 PM, Kelum Navaratne <kelum.nava at gmail.com>wrote:

> Hi Andreas,
>
> Thank you very much. This is a good start for me. I also need to work with
> freeswitch. Not asterisk. And simple point to point sip is more than enough
> and rtp bridge would be fantastic.
>
> Would it work with amr codec as well ? Or only gsm full rate/ h. Rate?
>
> Im trying to find the lcr git location of jolly/new. Can you please give
> me the url. I cant find it on openbsc git.
>
> Thanks again.
>
> Nava.
>
>
> On Tuesday, October 16, 2012, Andreas Eversberg wrote:
>
>> hi kelum,
>>
>> in order to use sip, you need jolly/new branch of lcr and jolly/rtpmux of
>> openbsc. the sip implementation of LCR is quite simple, so no
>> authentication or oder features - just simple point-to-point SIP. if you
>> run confiure of LCR, check if sip is enabled. in order to add a SIP
>> interface, do the following at interface.conf:
>>
>> [sip]
>> sip <local ip>[:<local port>] <remote ip>[:<remote port>]
>> earlyb yes
>> tones no
>>
>> you need to define local IP that will be used to connect to remote SIP
>> endpoint. don't use localhost, if the endpoint is on a different machine,
>> because this IP is also used for RTP. if you use same machine, you need to
>> have different ports. you may change local port, by adding a local port or
>> you may change port of SIP endpoint and then add remote port.
>>
>> i have tested it with freeswitch, but asterisk should work also.
>>
>> you may then also try at interface.conf below "[sip]" definition:
>>
>> rtp-brige
>>
>> then the codec (full rate or enhanced full rate) is negotiated between
>> mobile and the remote SIP endpoint. the SIP endpoint must support at least
>> one of it.
>>
>> regards,
>>
>> andreas
>>
>>
>>
>>
>>
>>
>>
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