hello,
after googling for some information about nathelper it seems that nathelper should be able to traverse any type of NAT (even symmetric ones) as long as both user agents support symmetric RTP.
is this right?
are there any situations where just using nathelper may not be sufficient? (such as transfers between an internal phone to an external phone or transfers between two internal phones).
bye, /gst
On 18-07-2005 19:57, Günther Starnberger wrote:
hello,
after googling for some information about nathelper it seems that nathelper should be able to traverse any type of NAT (even symmetric ones) as long as both user agents support symmetric RTP.
is this right?
Usually you also need RTP proxy to relay media.
are there any situations where just using nathelper may not be sufficient? (such as transfers between an internal phone to an external phone or transfers between two internal phones).a
In many situations relaying of RTP is also needed, especially if the phone is behind "symmetric" NATs. Traversing NATs with RTP relay can be done provided that one side of the call is in the public internet and supports symmetric RTP extensions (such as PSTN gateways, for example).
Jan.
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Günther Starnberger -
Jan Janak