Open Source Mobile Communications: Issueshttps://osmocom.org/https://osmocom.org/favicon.ico?16647414092019-09-12T14:07:31ZOpen Source Mobile Communications
Redmine OsmoMSC - Feature #4200 (In Progress): Work around nano3G-S16 requiring RAB ID to be below 16https://osmocom.org/issues/42002019-09-12T14:07:31Zefistokl
<p>Hardware: ip.access nano3g S16.</p>
<p>Tested against osmo-msc version branches 35c3 and cccamp19 (with Message Class and RAT GSUP IEs stripped out). Reproduced 3 times.</p>
<p>In the trace there are 17 incoming SIP calls. The last 2 failed (around packet 36826 and 37625). In the RAB-AssignmentResponse's for them I see "radioNetwork: failure-in-the-radio-interface-procedure (14)".</p>
<p>If I restart the osmo-msc, I can make another 15 calls.</p>
<p>IPs:<br />10.0.2.247 - nano3g S16<br />10.0.2.244 - RNC:<br /> - 10.0.2.244:5060 osmo-sip-connector<br /> - 10.0.2.244:5064 local PBX (kamailio)<br />172.48.2.1 - Remote PBX (kamailio)<br />172.48.1.5 - GSUP server</p>
<p>Note:<br />Apart from the osmocom software there is Kamailio and rtpengine installed alongside osmo-sip-connector to allow for transcoding. I've set it in a way so that it "sleeps" for 3 seconds before passing SIP INVITE to osmo-sip-connector. (If I don't do this then the UE will not respond to Paging Request (assuming it doesn't have enough time after Iu-Release which happens after USSD))</p>