Hi > > thank you guys for your answers. > i have no problem if i use just one codec as you mentioned Jared. my call > hangs up when i have voice class codec with more than one codec. i trace all > debug message and think that my cisco router can not transcode codecs to > each other. so when the codec of receiving call is different with the first > priority in cisco router, cisco can not transcode it, therefore call hangs > up. do > you think i am true or not??? if yes would you please tell me how configure my > router to transcode between different codecs (for example between alaw and > ulaw)? my cisco router is 2800.
If the call is terminating on the 2800 ( ie ip to tdm) there is no need to transcode.... It would just be a standard sip offer/answer dialog. As long as one codec matches it would be fine. If you have 2 ip legs you should look into cisco border element configs as an SBC. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book.html You can then decide how to work the codec selection and how the cisco interacts( interferes may be a better term) with the media session between the 2 legs Transcoding would only be necessary if you have two IP legs and each leg needs to use a different codec. Leg 1 g711a and leg2 g729 for example. The 2800 can do this http://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-border-element/100480-cube-transcode.html Regards Brian > > thank you > SAM _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
