diff options
Diffstat (limited to 'src/osmo-bsc/gsm_08_08.c')
| -rw-r--r-- | src/osmo-bsc/gsm_08_08.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/src/osmo-bsc/gsm_08_08.c b/src/osmo-bsc/gsm_08_08.c index 807eb8c44..19c259844 100644 --- a/src/osmo-bsc/gsm_08_08.c +++ b/src/osmo-bsc/gsm_08_08.c @@ -495,7 +495,17 @@ static bool complete_layer3(struct gsm_subscriber_connection *conn, if (gscon_is_aoip(conn)) { gen_bss_supported_codec_list(&scl, msc, conn_get_bts(conn)); - resp = gsm0808_create_layer3_2(msg, cgi_for_msc(conn->sccp.msc, conn_get_bts(conn)), &scl); + if (scl.len > 0) + resp = gsm0808_create_layer3_2(msg, cgi_for_msc(conn->sccp.msc, conn_get_bts(conn)), &scl); + else { + /* Note: 3GPP TS 48.008 3.2.1.32, COMPLETE LAYER 3 INFORMATION clearly states that + * Codec List (BSS Supported) shall be included, if the radio access network + * supports an IP based user plane interface. It may be intentional that the + * current configuration does not support any voice codecs, in those cases the + * network does not support an IP based user plane interface, and therefore the + * Codec List (BSS Supported) IE can be left out in those situations. */ + resp = gsm0808_create_layer3_2(msg, cgi_for_msc(conn->sccp.msc, conn_get_bts(conn)), NULL); + } } else resp = gsm0808_create_layer3_2(msg, cgi_for_msc(conn->sccp.msc, conn_get_bts(conn)), NULL); |