Hi Community,

Happy New Year!

Would like to ask if anyone here have experience integrating OsmoBSC to Nokia MSC? Currently we are doing the integration in Nokia MSC and we encountered issue. Basically, in the SCCP part, the BSC is trying to send UDT (BSSAP) Reset but no response from the MSC. After the default timer of the RESET, we observed a SACK SST and SACK UDTS. In the SACK SST, we saw the trace that there is no Calling indicator which is my BSC point code. When checking the trace we saw this Affected Subsystem Number: 254. I’ve red some documentations in OSMO but I don’t find any SCCP management configuration in OSMO so I think this one is on MSC side. Below is the Trace we captured.

BSC Point code - 2262

Nokia Point code - 7039

Logs Below:

<001f> sccp_scrc.c:420 sccp_scrc_rx_sclc_msg: HDR=(CL:CLDT,V=0,LEN=0),

PART(T=Routing Context,L=4,D=00000000),

PART(T=Protocol Class,L=4,D=00000000),

PART(T=Source Address,L=20,D=0002000380020008000008d680030008000000fe),

PART(T=Destination Address,L=20,D=000200038002000800001b7f80030008000000fe),

PART(T=Sequence Control,L=4,D=00000000),

PART(T=Data,L=6,D=000430040120)

<001f> osmo_ss7_hmrt.c:278 m3ua_hmdc_rx_from_l2(): dpc=7039=3.111.7 not local, message is for routing

<001f> osmo_ss7_hmrt.c:227 Found route for dpc=7039=3.111.7: pc=0=0.0.0 mask=0x0=0.0.0 via AS nokia_msc proto=m3ua

<001f> osmo_ss7_hmrt.c:233 rt->dest.as proto is M3UA for dpc=7039=3.111.7

<001f> m3ua.c:507 XUA_AS(nokia_msc)[0x11886f0]{AS_ACTIVE}: Received Event AS-TRANSFER.req

<0007> a_reset.c:110 A-RESET(msc-0)[0x1194c80]{DISC}: state_chg to DISC

<0007> fsm.c:189 A-RESET(msc-0)[0x1194c80]{DISC}: Timeout of T4

<0007> a_reset.c:106 A-RESET(msc-0)[0x1194c80]{DISC}: (re)sending BSSMAP RESET message...

<0007> osmo_bsc_sigtran.c:93 Sending RESET to MSC: RI=SSN_PC,PC=3.111.7,SSN=BSSAP

<001f> sccp_scrc.c:420 sccp_scrc_rx_sclc_msg: HDR=(CL:CLDT,V=0,LEN=0),

PART(T=Routing Context,L=4,D=00000000),

PART(T=Protocol Class,L=4,D=00000000),

PART(T=Source Address,L=20,D=0002000380020008000008d680030008000000fe),

PART(T=Destination Address,L=20,D=000200038002000800001b7f80030008000000fe),

PART(T=Sequence Control,L=4,D=00000000),

PART(T=Data,L=6,D=000430040120)

<001f> osmo_ss7_hmrt.c:278 m3ua_hmdc_rx_from_l2(): dpc=7039=3.111.7 not local, message is for routing

<001f> osmo_ss7_hmrt.c:227 Found route for dpc=7039=3.111.7: pc=0=0.0.0 mask=0x0=0.0.0 via AS nokia_msc proto=m3ua

<001f> osmo_ss7_hmrt.c:233 rt->dest.as proto is M3UA for dpc=7039=3.111.7

<001f> m3ua.c:507 XUA_AS(nokia_msc)[0x11886f0]{AS_ACTIVE}: Received Event AS-TRANSFER.req

<0007> a_reset.c:110 A-RESET(msc-0)[0x1194c80]{DISC}: state_chg to DISC

OSMOBSC Version:

OsmoBSC# show version

OsmoBSC 1.3.0.132-bcbc5 (OsmoBSC).

Contributions by Daniel Willmann, Jan Lübbe, Stefan Schmidt

Dieter Spaar, Andreas Eversberg, Sylvain Munaut, Neels Hofmeyr

License AGPLv3+: GNU AGPL version 3 or later <http://gnu.org/licenses/agpl-3.0.html>

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law.

OsmoBSC#

Regards,

Sonny Lafuente | Systems Engineer | Entropy Solution Philippines

Mobile: +639985365206 | Office: 028931781 | Email: sonny.lafuente@entropysolution.com

Office Address: Unit 2103 Antel Corporate Centre 121 Valero St. Salcedo Village Makati City Philippines 1227

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On 6 Jan 2021, at 8:41 AM, Sonny Lafuente <sonny.lafuente@entropysolution.com> wrote:

Hi Community,

Happy New Year!

Would like to ask if anyone here have experience integrating OsmoBSC to Nokia MSC? Currently we are doing the integration in Nokia MSC and we encountered issue. Basically, in the SCCP part, the BSC is trying to send UDT (BSSAP) Reset but no response from the MSC. After the default timer of the RESET, we observed a SACK SST and SACK UDTS. In the SACK SST, we saw the trace that there is no Calling indicator which is my BSC point code. When checking the trace we saw this Affected Subsystem Number: 254. I’ve red some documentations in OSMO but I don’t find any SCCP management configuration in OSMO so I think this one is on MSC side. Below is the Trace we captured.

BSC Point code - 2262

Nokia Point code - 7039

Regards,

Sonny

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