I am using Sofia-sip 1.12.10 for running my applciation.
In my application with Sofia-sip 1.12.10, I would like to send an INVITE
message with SDP attribute parameter "a=sendrecv".
I have tried 2 methods with nua_invite():
1)
g_chLocalSdpMedia[0] = '\0';
sprintf(g_chLocalSdpMedia,"m=image %d udptl t38\r\n",g_LocalRtpPort);
strcat(g_chLocalSdpMedia, "a=sendrecv\r\n");
strcat(g_chLocalSdpMedia, "a=T38MaxBitrate:14400\r\n");
strcat(g_chLocalSdpMedia, "a=T38FaxMaxDatagram:316\r\n");
strcat(g_chLocalSdpMedia, "a=T38FaxMaxBuffer::280\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());
2)
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=T38FaxMaxDatagram:316\r\n");
strcat(g_chLocalSdpMedia, "a=T38FaxMaxBuffer::280\r\n");
strcat(g_chLocalSdpMedia,"a=T38FaxRateManagement:transferredTCF\r\n");
nua_invite(op_active->handle,
/* other tags as needed ... */
SOATAG_ACTIVE_AUDIO(SOA_ACTIVE_SENDRECV),
SOATAG_USER_SDP_STR(g_chLocalSdpMedia),
SOATAG_RTP_SORT(SOA_RTP_SORT_LOCAL),
SOATAG_RTP_SELECT(SOA_RTP_SELECT_SINGLE),
TAG_END());
However, the problem is that we do not observe SDP attribute "a=sendrecv" in
the transmitted SIP INVITE packet. If we were to use "a=sendonly" or
"a=recvonly", it works with first method. But I want to send specifically
"a=sendrecv" attribute in INVITE (even though, its absence may corresspond to
default presence).
Could you please advise us on how we could use nua_invite() to have
"a=sendrecv" in the transmitted INVITE SDP.
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