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h323 to SIP calls

Can someone explain how h323 to SIP calls work & vice versa.

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Accepted Solutions
Cisco Employee

Re: h323 to SIP calls

The following messages are mapped:

SIP <---> H323

INVITE - SETUP

100 Trying - Call Proc

180 Ringing - Alerting

183 Session Progress - Progress

200 OK (for INVITE) - Connect

BYE - Release Complete

With H323 to SIP CUBE, if fast start occurs on one leg, early offer needs to happen on the other (and vice versa).  Most SIP devices these days to early offer (SDP in invite) so you typically need fast start enabled on both directions of the H323 leg for this design.

Check out this link for more information:

http://www.cisco.com/en/US/docs/ios/voice/cube/configuration/guide/vb-gw-h323sip_ps5640_TSD_Products_Configuration_Guide_Chapter.html

1 REPLY
Cisco Employee

Re: h323 to SIP calls

The following messages are mapped:

SIP <---> H323

INVITE - SETUP

100 Trying - Call Proc

180 Ringing - Alerting

183 Session Progress - Progress

200 OK (for INVITE) - Connect

BYE - Release Complete

With H323 to SIP CUBE, if fast start occurs on one leg, early offer needs to happen on the other (and vice versa).  Most SIP devices these days to early offer (SDP in invite) so you typically need fast start enabled on both directions of the H323 leg for this design.

Check out this link for more information:

http://www.cisco.com/en/US/docs/ios/voice/cube/configuration/guide/vb-gw-h323sip_ps5640_TSD_Products_Configuration_Guide_Chapter.html

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