Below are the debugs when called from one of the IP phones to PRI line number.
 
FDIB-HO-GW1#debug isdn q921
debug isdn q921 is              ON.
FDIB-HO-GW1#
*Mar  6 09:02:47.270: ISDN Se0/1/0:15 Q921: User TX -> INFO sapi=0 tei=0, ns=75 nr=19
*Mar  6 09:02:47.294: ISDN Se0/1/0:15 Q921: User RX <- RR sapi=0 tei=0 nr=76
*Mar  6 09:02:47.582: ISDN Se0/1/0:15 Q921: User RX <- INFO sapi=0 tei=0, ns=19 nr=76
*Mar  6 09:02:47.582: ISDN Se0/1/0:15 Q921: User TX -> RR sapi=0 tei=0 nr=20
*Mar  6 09:02:47.714: ISDN Se0/1/0:15 Q921: User RX <- INFO sapi=0 tei=0, ns=20 nr=76
*Mar  6 09:02:47.714: ISDN Se0/1/0:15 Q921: User TX -> RR sapi=0 tei=0 nr=21
*Mar  6 09:02:48.022: ISDN Se0/1/0:15 Q921: User RX <- INFO sapi=0 tei=0, ns=21 nr=76
*Mar  6 09:02:48.022: ISDN Se0/1/0:15 Q921: User TX -> RR sapi=0 tei=0 nr=22
FDIB-HO-GW1#
*Mar  6 09:02:48.030: ISDN Se0/1/0:15 Q921: User TX -> INFO sapi=0 tei=0, ns=76 nr=22
*Mar  6 09:02:48.050: ISDN Se0/1/0:15 Q921: User RX <- RR sapi=0 tei=0 nr=77
FDIB-HO-GW1#
*Mar  6 09:02:49.770: ISDN Se0/1/0:15 Q921: User TX -> INFO sapi=0 tei=0, ns=77 nr=22
*Mar  6 09:02:49.782: ISDN Se0/1/0:15 Q921: User TX -> INFO sapi=0 tei=0, ns=78 nr=22
*Mar  6 09:02:49.790: ISDN Se0/1/0:15 Q921: User RX <- RR sapi=0 tei=0 nr=78
*Mar  6 09:02:49.806: ISDN Se0/1/0:15 Q921: User RX <- RR sapi=0 tei=0 nr=79
*Mar  6 09:02:49.966: ISDN Se0/1/0:15 Q921: User RX <- INFO sapi=0 tei=0, ns=22 nr=79
*Mar  6 09:02:49.966: ISDN Se0/1/0:15 Q921: User TX -> RR sapi=0 tei=0 nr=23
*Mar  6 09:02:50.098: ISDN Se0/1/0:15 Q921: User RX <- INFO sapi=0 tei=0, ns=23 nr=79
*Mar  6 09:02:50.098: ISDN Se0/1/0:15 Q921: User TX -> RR sapi=0 tei=0 nr=24
FDIB-HO-GW1#
*Mar  6 09:02:50.342: ISDN Se0/1/0:15 Q921: User RX <- INFO sapi=0 tei=0, ns=24 nr=79
*Mar  6 09:02:50.342: ISDN Se0/1/0:15 Q921: User TX -> RR sapi=0 tei=0 nr=25
FDIB-HO-GW1#
*Mar  6 09:02:51.354: ISDN Se0/1/0:15 Q921: User RX <- INFO sapi=0 tei=0, ns=25 nr=79
*Mar  6 09:02:51.354: ISDN Se0/1/0:15 Q921: User TX -> RR sapi=0 tei=0 nr=26
FDIB-HO-GW1#un all
Port Statistics for unclassified packets is not turned on.
 
FDIB-HO-GW1#debug isdn q931
*Mar  6 08:55:03.454: %ISDN-6-CONNECT: Interface Serial0/1/0:30 is now connected to 4962480 N/A
FDIB-HO-GW1#debug isdn q931
debug isdn q931 is              ON.
FDIB-HO-GW1#
*Mar  6 08:55:08.634: ISDN Se0/1/0:15 Q931: Applying typeplan for sw-type 0x12 is 0x0 0x0, Calling num 2601
*Mar  6 08:55:08.634: ISDN Se0/1/0:15 Q931: Applying typeplan for sw-type 0x12 is 0x0 0x0, Called num 2637174
*Mar  6 08:55:08.634: ISDN Se0/1/0:15 Q931: TX -> SETUP pd = 8  callref = 0x1156 
        Bearer Capability i = 0x8090A3 
                Standard = CCITT 
                Transfer Capability = Speech  
                Transfer Mode = Circuit 
                Transfer Rate = 64 kbit/s 
        Channel ID i = 0xA9839D 
                Exclusive, Channel 29 
        Progress Ind i = 0x8183 - Origination address is non-ISDN  
        Calling Party Number i = 0x0081, '2601' 
                Plan:Unknown, Type:Unknown 
        Called Party Number i = 0x80, '2637174' 
                Plan:Unknown, Type:Unknown
*Mar  6 08:55:08.906: ISDN Se0/1/0:15 Q931: RX <- SETUP_ACK pd = 8  callref = 0x9156 
        Channel ID i = 0xA9839D 
                Exclusive, Channel 29
*Mar  6 08:55:09.034: ISDN Se0/1/0:15 Q931: RX <- CALL_PROC pd = 8  callref = 0x9156
FDIB-HO-GW1#
*Mar  6 08:55:09.322: ISDN Se0/1/0:15 Q931: RX <- SETUP pd = 8  callref = 0x17FF 
        Sending Complete 
        Bearer Capability i = 0x8090A3 
                Standard = CCITT 
                Transfer Capability = Speech  
                Transfer Mode = Circuit 
                Transfer Rate = 64 kbit/s 
        Channel ID i = 0xA98382 
                Exclusive, Channel 2 
        Progress Ind i = 0x8583 - Origination address is non-ISDN  
        Calling Party Number i = 0x2183, '212637174' 
                Plan:ISDN, Type:National 
        Called Party Number i = 0x81, '7174' 
                Plan:ISDN, Type:Unknown
*Mar  6 08:55:09.326: ISDN Se0/1/0:15 Q931: TX -> CALL_PROC pd = 8  callref = 0x97FF 
        Channel ID i = 0xA98382 
                Exclusive, Channel 2
FDIB-HO-GW1#
*Mar  6 08:55:11.066: ISDN Se0/1/0:15 Q931: TX -> ALERTING pd = 8  callref = 0x97FF 
        Progress Ind i = 0x8188 - In-band info or appropriate now available 
*Mar  6 08:55:11.290: ISDN Se0/1/0:15 Q931: RX <- ALERTING pd = 8  callref = 0x9156 
        Progress Ind i = 0x8288 - In-band info or appropriate now available 
FDIB-HO-GW1#un all
Port Statistics for unclassified packets is not turned on.
 
All possible debugging has been turned off
FDIB-HO-GW1#
*Mar  6 08:55:22.210: %ISDN-6-CONNECT: Interface Serial0/1/0:2 is now connected to 216636514 N/A
FDIB-HO-GW1#