Multiple smsc groups

Is it ok to have multiple smsc groups? 

I've got :

group = smsc
smsc-id = orangeshort
smsc = smpp
host = xxxxxxxxxx
port = 8000
receive-port = 8000
smsc-username = "xxxxx"
smsc-password = xxxxx
system-type = "SMPP"
dest-addr-ton = 1
dest-addr-npi = 1 
source-addr-ton = 3
source-addr-npi = 1 

group = smsc
smsc-id = orangelong
smsc = smpp
host = xxxxxxxxxx
port = 8000
receive-port = 8000
smsc-username = "xxxxx"
smsc-password = xxxxx
system-type = "SMPP"
dest-addr-ton = 1
dest-addr-npi = 1
source-addr-ton = 1
source-addr-npi = 1

If I try and set both of these to run concurrently, I get a failure on one of
the SMSC connections.

2003-03-27 21:34:59 [7] DEBUG: SMPP[orangeshort]: Sending enquire link:
2003-03-27 21:34:59 [7] DEBUG: SMPP PDU 0x8126760 dump:
2003-03-27 21:34:59 [7] DEBUG:   type_name: enquire_link
2003-03-27 21:34:59 [7] DEBUG:   command_id: 21 = 0x00000015
2003-03-27 21:34:59 [7] DEBUG:   command_status: 0 = 0x00000000
2003-03-27 21:34:59 [7] DEBUG:   sequence_number: 7 = 0x00000007
2003-03-27 21:34:59 [7] DEBUG: SMPP PDU dump ends.
2003-03-27 21:34:59 [7] ERROR: Unknown SMPP_PDU type, internal error.
2003-03-27 21:34:59 [7] ERROR: SMPP[orangeshort]: PDU unpacking failed.
2003-03-27 21:34:59 [7] DEBUG: SMPP[orangeshort]: Failed PDU follows.
2003-03-27 21:34:59 [7] DEBUG: Octet string at 0x8125a90:
2003-03-27 21:34:59 [7] DEBUG:   len:  12
2003-03-27 21:34:59 [7] DEBUG:   size: 13
2003-03-27 21:34:59 [7] DEBUG:   immutable: 0
2003-03-27 21:34:59 [7] DEBUG:   data: 80 00 00 00 00 00 00 03   ........
2003-03-27 21:34:59 [7] DEBUG:   data: 00 00 00 07               ....
2003-03-27 21:34:59 [7] DEBUG: Octet string dump ends.
2003-03-27 21:34:59 [7] ERROR: SMPP[orangeshort]: I/O error or other error. Re-connecting.

Thanks for any help.
Rory