res_pjsip_t38: T.38 error correction mode selection at 200 ok received
if asterisk offer T38 SDP with none error correction scheme and the endpoint respond with redundancy EC scheme, asterisk switch to that mode. Since we configure the endpoint as none EC mode we should not switch to any other mode except none. following logic implemented in code. 1. If asterisk offer none, and anything except none in answer will be ignored. 2. If asterisk offer fec, answer with fec, redundancy and none will be accepted. 3. If asterisk offer redundancy, answer with redundancy and none will be accepted. ASTERISK-28621 Change-Id: I343c62253ea4c8b7ee17abbfb377a4d484a14b19
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@ -740,12 +740,32 @@ static void t38_interpret_sdp(struct t38_state *state, struct ast_sip_session *s
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state->their_parms.rate_management = AST_T38_RATE_MANAGEMENT_TRANSFERRED_TCF;
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}
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} else if (!pj_stricmp2(&attr->name, "t38faxudpec")) {
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if (!pj_stricmp2(&attr->value, "t38UDPRedundancy")) {
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ast_udptl_set_error_correction_scheme(session_media->udptl, UDPTL_ERROR_CORRECTION_REDUNDANCY);
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} else if (!pj_stricmp2(&attr->value, "t38UDPFEC")) {
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ast_udptl_set_error_correction_scheme(session_media->udptl, UDPTL_ERROR_CORRECTION_FEC);
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if (session->t38state == T38_LOCAL_REINVITE) {
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if (session->endpoint->media.t38.error_correction == UDPTL_ERROR_CORRECTION_FEC) {
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if (!pj_stricmp2(&attr->value, "t38UDPFEC")) {
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ast_udptl_set_error_correction_scheme(session_media->udptl, UDPTL_ERROR_CORRECTION_FEC);
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} else if (!pj_stricmp2(&attr->value, "t38UDPRedundancy")) {
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ast_udptl_set_error_correction_scheme(session_media->udptl, UDPTL_ERROR_CORRECTION_REDUNDANCY);
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} else {
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ast_udptl_set_error_correction_scheme(session_media->udptl, UDPTL_ERROR_CORRECTION_NONE);
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}
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} else if (session->endpoint->media.t38.error_correction == UDPTL_ERROR_CORRECTION_REDUNDANCY) {
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if (!pj_stricmp2(&attr->value, "t38UDPRedundancy")) {
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ast_udptl_set_error_correction_scheme(session_media->udptl, UDPTL_ERROR_CORRECTION_REDUNDANCY);
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} else {
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ast_udptl_set_error_correction_scheme(session_media->udptl, UDPTL_ERROR_CORRECTION_NONE);
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}
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} else {
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ast_udptl_set_error_correction_scheme(session_media->udptl, UDPTL_ERROR_CORRECTION_NONE);
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}
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} else {
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ast_udptl_set_error_correction_scheme(session_media->udptl, UDPTL_ERROR_CORRECTION_NONE);
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if (!pj_stricmp2(&attr->value, "t38UDPRedundancy")) {
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ast_udptl_set_error_correction_scheme(session_media->udptl, UDPTL_ERROR_CORRECTION_REDUNDANCY);
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} else if (!pj_stricmp2(&attr->value, "t38UDPFEC")) {
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ast_udptl_set_error_correction_scheme(session_media->udptl, UDPTL_ERROR_CORRECTION_FEC);
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} else {
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ast_udptl_set_error_correction_scheme(session_media->udptl, UDPTL_ERROR_CORRECTION_NONE);
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}
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}
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}
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