[Freeswitch-users] Linphone + Freeswitch + SRTP

[Brian West]

Get a packet capture, it would appear something is truncating the packet.

On Wed, Nov 4, 2015 at 8:06 AM, Jurijs Ivolga <jurij.ivo at gmail.com> wrote:

> Hi,
>
> First of all I'm sorry if this not a really good place to ask, but I
> spotted very strange behavior using Linphone and Freeswitch.
>
> I'm not sure that this is 100% Freeswitch bug, but maybe you point me to
> proper direction.
>
> Test environment:
>
> Linphone =SRTP==> Freeswitch =SRTP==> 2nd Linphone
>
> Linphone & 2nd Linphone located behind NAT in same private network.
>
> 1) This invite is sent from Linphone to Freeswitch:
>
> I left only SDP part where all ciphers are listed(same I did for all other
> sip packages)
>
> a=crypto:1 AES_CM_128_HMAC_SHA1_80
> inline:2QEye591aHIqRwdLODMrr8ieQBBHl5WdIizE0NH2.
> a=crypto:2 AES_CM_128_HMAC_SHA1_32
> inline:d6K8m+tGEMvkEbRm5Zzy6KQkrlwS78l7wGufgx8S.
> a=crypto:3 AES_CM_256_HMAC_SHA1_80
> inline:PMvGinW3fpIejXOWDskUNWUhBX1KRlhrPkbrP0Nv4L/+My1V7w2r/ALSyLhkPg==.
> a=crypto:4 AES_CM_256_HMAC_SHA1_32
> inline:ZsdwMe0D+RauGydaQ90qG7pfOvdW6m9cxjbBhJ5AUaNSTecse9Sk3lRzlgZuSA==.
>
> 2) Trying from Freeswitch
>
> 3) Freeswitch replies Proxy Authentication Required
>
> 4) ACK from Linphone
>
> 5) Linphone sends one more invite to Freeswitch:
>
> a=crypto:1 AES_CM_128_HMAC_SHA1_80
> inline:2QEye591aHIqRwdLODMrr8ieQBBHl5WdIizE0NH2.
> a=crypto:2 AES_CM_128_HMAC_SHA1_32 inline:d6K8m+tGEMvkEbRm5Zzy6KQkrlwS
>
> *As we can see this is something very strange, cause Linphone first invite
> send 4 ciphers, but now it sends only 2 and it looks like that second one
> is missing something.*
>
> 6) Trying from freeswitch
>
> 7) Invite sent from Freeswitch to 2nd Linphone
>
> a=crypto:1 AEAD_AES_256_GCM_8
> inline:jotCMStRYMvwWT18wMqmgwAu6mVBKaIkENGh8HLF0UYFEcwGnoQpM0m4juU.
> a=crypto:2 AEAD_AES_128_G
>
> And as we can see in Invite from Freeswitch to 2nd Linphone ciphers are
> completely different from what Linphone sent in second Invite. I think this
> is not 100% Linphone bug. What you think?
>
> Full sip trace you can find in attachemnt, additionnally I will rase same
> issue on Linphone side.
>
> With kind regards,
>
> Jurijs
>
>
>
>
> _________________________________________________________________________
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>
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-- 

*Brian West*
brian at freeswitch.org


*Twitter: @FreeSWITCH , @briankwest*
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