[cisco-voip] ENUM, SIP and H.323

[Klaus Darilion]

Hi!

Im trying to configure an AS5300 to accept calls from the PSTN, make an 
ENUM lookup and depending on the lookup (sip or h323 NAPTR records) the 
call should be forwarded to a sip or a h323 destination. The problem is, 
that the Cisco GW first chooses a VoIP stack (per default dial peers 
will be h323 - sip can be choosen by configuring "session protocol 
sipv2") and then makes the ENUM lookup. If the ENUM lookup is done in a 
sip dial-peer and there is no NAPTR record with a sip address, but with 
a h323 address, the GW can not call the h323 endpoint as it already has 
activated the sip stack.

Therefore the ENUM lookup has to be done before finding the outgoing 
dail-peer. Can this be done with a Tcl script - e.g. the incoming dial 
peer calls a Tcl application, the Tcl application performs an ENUM 
lookup and adds a prefix to the destination phone number. This way I 
could have an  matching dial-peer for h323 and one for SIP.

regards,
Klaus