Monday, November 09, 2009

ISUP Circuits Stay in Quarantine State

> Dear Mr. ss7box,
>
>     Can you give me some insight into what theses messages are telling me:
>
> Nov  9 15:12:45 tele2ss7 sangoma_isupd[21182]:
> W:sb_cmm.c:cmm_quarantine_ckt:CQ_WAIT_TIMER:go back to
> CQ_WAIT_SG:span/chan/event_id/caller follow:10:22:1019:8
> Nov  9 15:12:45 tele2ss7 sangoma_isupd[21182]:
> W:sb_cmm.c:cmm_quarantine_ckt:CQ_WAIT_TIMER:go back to
> CQ_WAIT_SG:span/chan/event_id/caller follow:10:19:1019:8
> Nov  9 15:12:45 tele2ss7 sangoma_isupd[21182]:
>
> Puzzled

Dear Puzzled,

My first guess is that the remote side is not responding to our reset circuit messages. If this goes on long enough the circuit will be quarantined and stay in the quarantined state until the remote side answers our resets.

Sometimes this happens because the NI and PRIO values in MTP3 for ISUP on our side are not matched to those of the remote side. You can check this by using /ss7box/ss7box_cli --show msu on and looking in /ss7box/msu.log. Examine the inbound and outbound messages for a particular point code pair and ensure that the NI and PRIO values are the same.

If the values are the same then you'll most likely need to work with the remote telco to find out why they are not responding to the circuit reset. The telco on the remote side may or may not care about helping you, and it may be a function of their ability to help you.

If the values are different then make necessary changes to the NI and PRIO  columsn for this trunk group in the ss7boost section (soon to be renamed the isupd section) of the configuration spreadsheet and use the smgcfg tool to make a new sangoma_isup.conf. Apply the new conf and see if problem is resolved.