I have an ISDN connected to a voice (MGCP) gateway with a number range YYY. Now when users call the external number, they are translated into a 5 digit extension using translation pattern in Call Manager and speech path is established, no issue. now, this site had an old ISDN number range XXX which when called is diverted in the PSTN cloud to the new existing number range YYY on the ISDN. Since some of the customer still dial the old number as it was advertised previously, so we diverted that to this new number range which is being used on existing ISDN. Problem is that there is a 10 second delay in establishing a speech path when Customers from outside call the old ISDN number. Diversion happens fairly quickly as seen from debug isdn q931. So not sure why this extra delay is induced in speech path when users call old number which gets translated to new number. Any pointers for this 1 ? Thanks !