Am 25.08.2011 11:16, schrieb Timo Reimann: > On 25.08.2011 10:31, Klaus Darilion wrote: >> > Am 25.08.2011 10:14, schrieb Jason Penton: >>> >> >>> >> From some initial work and testing I can confirm that this works ONLY >>> >> when using the top Via *without* branch tags. Not sure what impact this >>> >> could have? >>> >> This is because a BYE results in a different set of branch tags from the >>> >> original set of invite branches - I am investigating why and how this >>> >> works now. >> > >> > Sure. the branch tag is a transaction identifier and must be unique in >> > space and time. Thus, BYE must have another tag. That's why I said you >> > have to put some data into RR cookies - this is the only data which >> > stays the same during the dialog (except tags and call-id). >> > >> > If you only want to know if an in-dialog request is from orig->term or >> > from term->orig, then the is_direction function is already sufficient. >> > >> > If you want to detect a certain spiral leg in dialog module, IMO you >> > have to add another matching parameter (besides tags and call-id) to >> > dialog module which will be set as RR-cookie and retrieved from Route >> > header for in-dialog requests. Every time the initial requests spirals >> > through the proxy, you have to add such a cookie which of course must be >> > different to the previous inserted cookie (therefore ftag is not >> > sufficient anymore) - either generate a random identifier or reuse some >> > data from the message (e.g. you could copy branch-tag to RR header as it >> > should be unique) > Let me emphasize that you don't need to add a new RR cookie: You can > re-use the existing one that implements DID mode and simply extend the > hash function to cover that extra value you choose. (Random number or > branch parameter, as Klaus mentioned; see my comments below though.)
Indeed - I have not thought about this parameter. If it would be extended to be unique it should work - as long as the DID value in in-dialog requests is correct. Thus, DID_FALLBACK mode would not work anymore. regards Klaus _______________________________________________ sr-dev mailing list [email protected] http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-dev
