Re: NAT64 on iOS and SDP media address

[John Gathm <john.gathm@xxxxxxxxx>]

Hi Nick

Thanks for your answer.

I will be digging into that.

Any chance you can share some code/hints ?

Btw there seems to be an RFC specifically dealing with SIP and NAT64 clients

https://tools.ietf.org/html/rfc7225#section-5.2

J.G.

On Monday, May 23, 2016, Nick Dowell <nick@xxxxxxxxxxxxxx> wrote:

I was able to work around this media issue by implementing a pjsip_module that rewrites the SDP - replacing the IP4 addresses with IP6 on incoming messages and replacing IP6 with IP4 on outgoing messages.

With this module in place, my app is able to make and receive calls when connected over a NAT64 network.

Hope that helps,

Nick

On 23 May 2016, at 07:11, John Gathm <john.gathm@xxxxxxxxx> wrote:

Hello

I am working on making my app support NAT64 on iOS and connect to an IPv4 SIP Server

Following wiki instructions and the proxy workaround, I was able to connect to the SIP server using NAT64.

https://trac.pjsip.org/repos/wiki/IPv6

SIP messages are properly exchanged between NAT64'ed SIP server and IPV6 iOS PJSIP

However, the media session does not work, I guess this is because the INVITE message sent by the server contains the IPv4 of the server and there is no mechanism to deal with it.

19:20:42.648   pjsua_call.c !Answering call 0: code=200
19:20:42.648  inv0x16cad664  ..SDP negotiation done, status=0
19:20:42.648   pjsua_call.c  ...Call 0: remote NAT type is 0 (Unknown)
19:20:42.648  pjsua_media.c  ...Call 0: updating media..
19:20:42.648  pjsua_media.c  ....pjmedia_stream_info_from_sdp() failed for call_id 0 media 0: Unsupported address family (PJ_EAFNOTSUP)
19:20:42.649  pjsua_media.c  ....Error updating media call00:0: Unsupported address family (PJ_EAFNOTSUP)
19:20:42.649   pjsua_call.c  ...Unable to create media session: No active media stream after negotiation (PJMEDIA_SDPNEG_ENOMEDIA) [status=220048]
19:20:42.649  inv0x16cad664  ....Sending Response msg 488/INVITE/cseq=91632755 (tdta0x16528600)
19:20:42.649  dlg0x16cad664  .....Sending Response msg 488/INVITE/cseq=91632755 (tdta0x16528600)
19:20:42.649  tsx0x16c5fe64  .....Sending Response msg 488/INVITE/cseq=91632755 (tdta0x16528600) in state Proceeding
19:20:42.650   pjsua_core.c  ......TX 498 bytes Response msg 488/INVITE/cseq=91632755 (tdta0x16528600)  

SIP/2.0 488 Not Acceptable Here

Is there some workaround I could use to force media address, or should I follow the changes that are happening right now in this ticket dedicated to NAT64 ?

http://trac.pjsip.org/repos/ticket/1922

regards

J.G.

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