>Hi,
>
>I am trying to establish a fax session between two gateways using Sofia sip
>calls. I have already established the audio call using Sofia SIP INVITE.
>Following that, I am trying to establish fax call, with another INVITE
>message. Following is the code I am using to send INVITE message for fax. Note
>that before this INVITE a audio call is already established between two
>gateways.
>
> g_chLocalSdpMedia[0] = '\0';
> sprintf(g_chLocalSdpMedia,"m=image %d udptl t38\r\n",g_LocalRtpPort);
> strcat(g_chLocalSdpMedia, "a=T38MaxBitrate:14400\r\n");
> strcat(g_chLocalSdpMedia,"a=T38FaxRateManagement:transferredTCF\r\n");
>
> nua_invite(op_active->handle,
> /* other tags as needed ... */
> SOATAG_USER_SDP_STR(g_chLocalSdpMedia),
> SOATAG_RTP_SORT(SOA_RTP_SORT_LOCAL),
> SOATAG_RTP_SELECT(SOA_RTP_SELECT_SINGLE),
> TAG_END());
>
>With this I am expecting to see:-
>
>" m= image 9000 udptl t38
> a= T38MaxBitrate:14400
> a=T38FaxRateManagement:transferredTCF"
>
>But when I see in the network capture file, I am seeing this request
>incorporates a request for media audio with port 0 like
>
>"m= audio 0 RTP/AVP 19
> m= image 9000 udptl t38
> a= T38MaxBitrate:14400
> a=T38FaxRateManagement:transferredTCF"
>
>
>Why Sofia sip stack is adding the "m=audio 0 RTP/AVP 19" preceding the actual
>t38 media message. I have captured another log where two D-link gateways
>communicate for T.38 Fax, and there I do not see such a request preceding T38
>INVITE message. I am suspecting it is causing interfacing problems for my
>gateway to establish fax sessiob with D-link gateway.
>
>Could anybody please tell me how should I avoid this audio media line being
>prepended to the fax image media line request in INVITE SDP message.
>
>With Best Regards,
>Kaustubh Patwardhan
>
>
>
>
>
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