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Thanks a lot ISDNman. One more question...If that's the case then why do u think Cisco Routers have this overlap send/receive feature...and this feature is being used also... You google on overlap send/receive and u can find a lot of results showing overlap configuration for cisco routers...

Hey ISDNman, Am programming an enterprise router which will be connected to a PBX. In case of DID(Direct Inward Dialing) where PBX will be assigned a range of numbers and considering that some prefix digits(say first 6 digits)remain same and is exclusive for this PBX then CO switch...

Hey Everyone, Am trying to implement overlap receive. When I get a SETUP message without a sendcomplete IE(which is not compulsory to be present) how do I check whether I've received complete called Party Number or not....i.e whether I should respond with a SETUPACK or CALLPROCEEDING...

Hi, Can anyone tell me wats the difference b/w the voice chat we use in messengers and the VOIP calls. Thanks

Thanks ISDNman it was really helpful. You said If terminating device is ISDN, the terminating switch sends an SETUP to the terminating device. Terminating device replies with ALERTing. Terminating switch sends the ALERTing message to the originating switche which sends an ALERTing message to...

Thanks again. Let me see whether I have got it right.....is it that the numbers are collected at the local switch and routed to the destination network.....and then the destination network sends a SETUP message to the called user which,gets the ACK and then sends the remaining INFORMATION...

Thanks for replying. Is there any situation where u need to use the overlap and cannot do with the enbloc.

Thanks ISDNman, But my question is called user returns SETUP ACKNOWlEDGE when SETUP contains no or some number..but how does the SETUP message reach the called user when there is no number for the network to route the SETUP message. Hope you got my question. Eagerly wiating for your...

Hi All, I have this question...ITU-T's Q.931 recommendation says Overlap Receiving When a user determines that a received SETUP message contains either: a) no called number information; or b) incomplete called number information; or c) called number information which the user cannot...

Can anyone explain to me the advantages of overlap signalling over enbloc. Thanks