[Linphone-users] sip.linphone.org: RTP connection not established when using IPv4

[Tere Ruiz]

Good morning,

We are having some issues with SIP calls using IPv4 with sip.linphone.org. The remote client fails to establish the RTP connection because the SDP only contains an IPv6 address.

After some testing, it seems that if the original SDP contains ICE data, the RTP stream is established. Otherwise, an IPv6 address is sent and connection fails.

These are the results with Linphone Android:

- With both ICE and Stun : OK

- Stun and No ICE : Not working

- No stun nor ICE: Not working

After having a look at recent changes, I'm pretty sure it has to do with the following commit.

https://github.com/BelledonneCommunications/flexisip/commit/2caed30c8aebb7233ac7384eb438644ebad19a5b

I think it is detecting it as IPv6 even if the client has established an IPv4 connection.

Thank you,

Tere Ruiz

PS. I have also sent the email to flexisip-developers mailing list. But I am not getting confirmation and it does not appear in the achives. So I have decided to resend it here too.