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IP to IP tunnel is getting disconnected


we have connected our UC540 to CME on a 2811 router via IP-IP tunnel as DMVPN has some restrictions at the other end's  ISP.

the issue is the tunnel is getting discoonnected frequently while it is showing that tunnel and line protocol both are up.

sh int tu1

Tunnel1 is up, line protocol is up

  Hardware is Tunnel

  Description: ToTehran

  Internet address is

  MTU 17920 bytes, BW 100 Kbit/sec, DLY 50000 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation TUNNEL, loopback not set

  Keepalive set (10 sec), retries 3

  Tunnel source X.X.X.X (FastEthernet0/0), destination Y.Y.Y.Y

  Tunnel protocol/transport IP/IP (NOS)

  Tunnel TTL 255

  Tunnel transport MTU 1480 bytes

  Tunnel transmit bandwidth 8000 (kbps)

  Tunnel receive bandwidth 8000 (kbps)

  Last input 00:17:56, output 00:17:00, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/0 (size/max)

  30 second input rate 0 bits/sec, 0 packets/sec

  30 second output rate 0 bits/sec, 0 packets/sec

     158 packets input, 13218 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

     435 packets output, 35775 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     0 unknown protocol drops

     0 unknown protocol drops

     0 output buffer failures, 0 output buffers swapped out

any idea how can I solve this problem?

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