From 0d9a1a7583842203cbbd60517a2c4d63247db954 Mon Sep 17 00:00:00 2001 From: Philipp Maier Date: Thu, 7 Mar 2019 16:50:34 +0100 Subject: AMR: Signal usage of octet-aligned or bandwith-efficient mode to MSC MGCP/SDP provides fmtp parameters in order to signal which of the two available AMR framing modes (octet-aligned or bandwith-efficient) should be used on the link between BSS and core network. osmo-bsc currently does not set up this mode which means that the RTP packets from the BTS are forwared without inspection/modification, which may lead to malfunction when a BTS is using a framing mode that is not supported by the other end. - Add VTY option to setup the framing mode - Generate related fmtp parameters in SDP Depends: osmo-mgw I622c01874b25f5049d4f59eb8157e0ea3cbe16ba Change-Id: If6d40b2407b87aad2227ea7f15533ef01a3771b3 Related OS#3807 --- src/osmo-bsc/mgw_endpoint_fsm.c | 19 +++++++++++++++++++ src/osmo-bsc/osmo_bsc_vty.c | 23 +++++++++++++++++++++++ 2 files changed, 42 insertions(+) (limited to 'src') diff --git a/src/osmo-bsc/mgw_endpoint_fsm.c b/src/osmo-bsc/mgw_endpoint_fsm.c index fc49886c3..5462914fb 100644 --- a/src/osmo-bsc/mgw_endpoint_fsm.c +++ b/src/osmo-bsc/mgw_endpoint_fsm.c @@ -34,6 +34,7 @@ #include #include #include +#include #define LOG_CI(ci, level, fmt, args...) do { \ if (!ci || !ci->mgwep) \ @@ -774,4 +775,22 @@ void mgcp_pick_codec(struct mgcp_conn_peer *verb_info, const struct gsm_lchan *l verb_info->ptmap[0].pt = custom_pt; verb_info->ptmap_len = 1; } + + /* AMR requires additional parameters to be set up (framing mode) */ + if (verb_info->codecs[0] == CODEC_AMR_8000_1) { + verb_info->param_present = true; + verb_info->param.amr_octet_aligned_present = true; + } + + if (bss_side && verb_info->codecs[0] == CODEC_AMR_8000_1) { + /* FIXME: At the moment all BTSs we support are using the + * octet-aligned payload format. However, in the future + * we may support BTSs that are using bandwith-efficient + * format. In this case we will have to add functionality + * that distinguishes by the BTS model which mode to use. */ + verb_info->param.amr_octet_aligned = true; + } + else if (!bss_side && verb_info->codecs[0] == CODEC_AMR_8000_1) { + verb_info->param.amr_octet_aligned = lchan->conn->sccp.msc->amr_octet_aligned; + } } diff --git a/src/osmo-bsc/osmo_bsc_vty.c b/src/osmo-bsc/osmo_bsc_vty.c index 6e3d1c190..78196cfc4 100644 --- a/src/osmo-bsc/osmo_bsc_vty.c +++ b/src/osmo-bsc/osmo_bsc_vty.c @@ -100,6 +100,11 @@ static void write_msc_amr_options(struct vty *vty, struct bsc_msc_data *msc) WRITE_AMR(vty, msc, "5_15k", m5_15); WRITE_AMR(vty, msc, "4_75k", m4_75); #undef WRITE_AMR + + if (msc->amr_octet_aligned) + vty_out(vty, " amr-payload octet-aligned%s", VTY_NEWLINE); + else + vty_out(vty, " amr-payload bandwith-efficient%s", VTY_NEWLINE); } static void write_msc(struct vty *vty, struct bsc_msc_data *msc) @@ -952,6 +957,23 @@ DEFUN_DEPRECATED(cfg_net_msc_dest, cfg_net_msc_dest_cmd, ALIAS_DEPRECATED(cfg_net_msc_dest, cfg_net_msc_no_dest_cmd, "no dest A.B.C.D <1-65000> <0-255>", NO_STR LEGACY_STR "-\n" "-\n" "-\n"); +DEFUN(cfg_net_msc_amr_octet_align, + cfg_net_msc_amr_octet_align_cmd, + "amr-payload (octet-aligned|bandwith-efficient", + "Set AMR payload framing mode\n" + "payload fields aligned on octet boundaries\n" + "payload fields packed (AoIP)\n") +{ + struct bsc_msc_data *data = bsc_msc_data(vty); + + if (strcmp(argv[0], "octet-aligned") == 0) + data->amr_octet_aligned = true; + else if (strcmp(argv[0], "bandwith-efficient") == 0) + data->amr_octet_aligned = false; + + return CMD_SUCCESS; +} + int bsc_vty_init_extra(void) { struct gsm_network *net = bsc_gsmnet; @@ -996,6 +1018,7 @@ int bsc_vty_init_extra(void) install_element(MSC_NODE, &cfg_net_msc_amr_5_90_cmd); install_element(MSC_NODE, &cfg_net_msc_amr_5_15_cmd); install_element(MSC_NODE, &cfg_net_msc_amr_4_75_cmd); + install_element(MSC_NODE, &cfg_net_msc_amr_octet_align_cmd); install_element(MSC_NODE, &cfg_net_msc_lcls_mode_cmd); install_element(MSC_NODE, &cfg_net_msc_lcls_mismtch_cmd); install_element(MSC_NODE, &cfg_msc_acc_lst_name_cmd); -- cgit v1.2.3