There are several things which can be checked:
SUCC-CALL shows the number of successful calls made using the ISDN backup.
TIME-CALL shows the using total time of ISDN backup.
[11:09:16] ABILIS_CPX:
d s pv-1
RES:Pv-1 - PV over IP (Abilis tunnel) with Abilis Back-up (IP-BCK) ------------ To_Abilis_2 --- Cleared 0 days 14:21:21 ago, on 04/06/2015 at 18:08:48 ------------- - Link ----------------------------------------------------------------- TIME-CUR-CALL:0 RTY:0 DDT:NOMAX VDT:NOMAX USRTY:0 TDEL:0 TREM:0 PLINK-DN1:1 PLINK-DN2:1 PLINK-LC-TOUT:0 SLINK-ST1:0 SLINK-ST2:0 SLINK-LC-TOUT:0 -----------|---INPUT---|--OUTPUT---|-----------|---INPUT---|--OUTPUT---| FAIL-CALL | 0| 0|SUCC-CALL | 0| 0| TIME-CALL | 0| 0| | | | V-NO-CRKEY | 0| 0|D-NO-CRKEY | 0| 0| V-BAD-CIPH | 0| |D-BAD-CIPH | 0| | D-COMP-YES | 0| 0|D-COMP-ORIG| 0| 0| D-COMP-NO | 0| 0|D-COMP-DONE| 0| 0| D-BAD-COMP | 0| 0|D-COMP% | 0| 0| ------------------------------------------------------------------------ - IP Tunnel ------------------------------------------------------------ -----------|---INPUT---|--OUTPUT---|-----------|---INPUT---|--OUTPUT---| CHR | 68919| 137853|FRM | 11487| 11487| IP-CHR | 390555| 459489|IP-FRM | 11487| 11487| BAD-SRC | 0| |NO-SERV | 0| | NO-CRKEY | 0| 0|BAD-CIPH | 0| 0| CLI-TOUT | 0| |CLI-REMAP | 0| | V-RED-FM | | 0|V-RED-VOICE| | 0| -----------|--DATA IN--|-VOICE-IN--|-CHECK IN--|-----------------------| MISSING | 0| 0| 0| NOBUF | 0| 0| 0| ------------------------------------------------------------------------ -- Local and remote packet loss analisys, total and last 5 mins -------- ------------------------------------------------------------------------ -----------|-MISSING-D-|---FRM-D---|-MISSING-V-|---FRM-V---|-M-D%|-M-V%| LOC-TOTAL | 0| 0| 0| 0| 0.00| 0.00| LOC-5min | 0| 0| 0| 0| 0.00| 0.00| REM-TOTAL | N/A| N/A| N/A| N/A| N/A| N/A| REM-5min | N/A| N/A| N/A| N/A| N/A| N/A| ------------------------------------------------------------------------ -- Time arrival variation of voice frames after reordering (msec.) ----- ------------------------------------------------------------------------ 0- 20 | 0 ( 0% ) | 151-200 | 0 ( 0% ) | 21- 50 | 0 ( 0% ) | 201-300 | 0 ( 0% ) | 51-100 | 0 ( 0% ) | 301-600 | 0 ( 0% ) | 101-150 | 0 ( 0% ) | 601-xxx | 0 ( 0% ) | ------------------------------------------------------------------------
System log: informs about the state of tunnels. If the LLOG parameter of the PV/AIPT resource is set to ALL+E, the time when the ISDN backup is used is stored in the system log.