IP Stack no activated.

I'm trying to connect two routers (7206 and 1700) via a serial
interface over IP. Currently the serial communicates perfectly via IPX.
I've just confgured ip addresses on both sides with a /30 mask and
encapsulation is PPP but they cannot ping each other. I even tried HDLC
but the IP stack on the interface cannot even open. I have attached the
"show interface" command output of both routers:

1700 Router

Serial1/0 is up, line protocol is up
Hardware is CD2430 in sync mode
Description: LINK TO SAFEX
Internet address is 192.168.15.70/30
MTU 1500 bytes, BW 128 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 5/255
Encapsulation PPP, loopback not set
Keepalive set (10 sec)
DTR is pulsed for 4294967 seconds on reset, Restart-Delay is 541942
secs
LCP Open
Closed: CDPCP
Open: IPXCP
Last input 00:00:01, output 00:00:01, output hang never
Last clearing of "show interface" counters 1w5d
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 4000 bits/sec, 2 packets/sec
5 minute output rate 1000 bits/sec, 3 packets/sec
489253 packets input, 111702134 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
1110 input errors, 681 CRC, 0 frame, 0 overrun, 0 ignored, 429
abort
599055 packets output, 25929293 bytes, 0 underruns
0 output errors, 0 collisions, 39 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up


7206 Router

SAFEX-7200-2#sh int s3/0:10
Serial3/0:10 is up, line protocol is up
Hardware is Multichannel E1
Description: "Market Traders, Tim Gibson #57-03048-00"
Internet address is 192.168.15.69/30
MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, crc 16, CRC 16, Data non-inverted
Keepalive set (10 sec)
LCP Open
Open: IPXCP
Last input 00:00:14, output 00:00:00, output hang never
Last clearing of "show interface" counters 10:49:38
Input queue: 0/75/0 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/4/16 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
60631 packets input, 3053947 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0* throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
42071 packets output, 13260031 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
no alarm present
Timeslot(s) Used:10, subrate: 64Kb/s, transmit delay is 0 flags

.

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