path: root/include/osmocom
diff options
authorPau Espin Pedrol <pespin@sysmocom.de>2019-04-16 15:47:59 +0200
committerPau Espin Pedrol <pespin@sysmocom.de>2019-05-13 17:54:44 +0200
commit18506c850c3bbcbfa814e07dc02a17fdb5f7bb9a (patch)
treedc184100572bce10bf914f030f35f18387d8db7c /include/osmocom
parent38176d297d63af994dcd2d96bdc0b93895db98dd (diff)
gsm0808: Introduce Osmocom extensions to announce Osmux support
IE GSM0808_IE_OSMO_OSMUX_SUPPORT (T, 1 byte) is sent in AoIP appended to BSSMAP RESET in order to announce the peer that its MGW supports handling Osmux streams upon call set up. IE GSM0808_IE_OSMO_OSMUX_CID (TV, T 1 byte & V 1 byte) is sent in AoIP during call set up: * MSC->BSC Assignment Request * BSC->MSC Assignemnt Complete The 1 byte value contains the local Osmux CID, aka the recvCID aka CID where the peer sending the Assign Req/Compl will look for Osmux frames on that call. Hence, the peer receiving this CID value must use it to send Osmux frames for that call. As a result, a given call leg BSC<->MSC can have one different Osmux CID per direction. For example: * MS => MGW_BSC ==CID 0==> MGW_MSC * MS <= MGW_BSC <=CID 1=== MGW_MSC This allows for setups with 256 call legs per BSC on scenarios where NAT is not a problem, where MSC can have a pool of 256 CID per MGW_BSC (or remote peer). Related: OS#2551 Change-Id: I28f83e2e32b9533c99e65ccc1562900ac2aec74e
Diffstat (limited to 'include/osmocom')
2 files changed, 5 insertions, 0 deletions
diff --git a/include/osmocom/gsm/gsm0808_utils.h b/include/osmocom/gsm/gsm0808_utils.h
index 3a7beb70..9cfaea68 100644
--- a/include/osmocom/gsm/gsm0808_utils.h
+++ b/include/osmocom/gsm/gsm0808_utils.h
@@ -100,6 +100,7 @@ uint8_t gsm0808_enc_aoip_trasp_addr(struct msgb *msg,
const struct sockaddr_storage *ss);
int gsm0808_dec_aoip_trasp_addr(struct sockaddr_storage *ss,
const uint8_t *elem, uint8_t len);
+int gsm0808_dec_osmux_cid(uint8_t *cid, const uint8_t *elem, uint8_t len);
uint8_t gsm0808_enc_lcls(struct msgb *msg, const struct osmo_lcls *lcls);
int gsm0808_dec_lcls(struct osmo_lcls *lcls, const struct tlv_parsed *tp);
diff --git a/include/osmocom/gsm/protocol/gsm_08_08.h b/include/osmocom/gsm/protocol/gsm_08_08.h
index aa01ee5c..9806e083 100644
--- a/include/osmocom/gsm/protocol/gsm_08_08.h
+++ b/include/osmocom/gsm/protocol/gsm_08_08.h
@@ -303,6 +303,10 @@ enum GSM0808_IE_CODING {
+ /* Osmocom extensions: */
+ GSM0808_IE_OSMO_OSMUX_CID = 0xf1,
/* 3GPP TS 48.008 3.2.3 Signalling Field Element Coding */