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rsl.adoc: add info about RSL_IE_OSMO_REP_ACCH_CAP

Change-Id: I1d40f688ad1729efffee846e7f9efd06cf64ce28
Related: OS#5688
---
M doc/manuals/abis/rsl.adoc
1 file changed, 20 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/28/30728/1

diff --git a/doc/manuals/abis/rsl.adoc b/doc/manuals/abis/rsl.adoc
index ab1d5e7..2f8edbb 100644
--- a/doc/manuals/abis/rsl.adoc
+++ b/doc/manuals/abis/rsl.adoc
@@ -864,6 +864,7 @@
 | 0x01 | RSL_IE_CHAN_NR | <<RSL_IE_CHAN_NR>>
 | 0x60 | RSL_IE_OSMO_REP_ACCH_CAP | <<RSL_IE_OSMO_REP_ACCH_CAP>>
 | 0x61 | RSL_IE_OSMO_TRAINING_SEQUENCE | <<RSL_IE_OSMO_TRAINING_SEQUENCE>>
+| 0x64 | RSL_IE_OSMO_HR_GSM_RTP_FMT | <<RSL_IE_OSMO_HR_GSM_RTP_FMT>>
 | 0xf0 | RSL_IE_IPAC_REMOTE_IP | <<RSL_IE_IPAC_REMOTE_IP>>
 | 0xf1 | RSL_IE_IPAC_REMOTE_PORT | <<RSL_IE_IPAC_REMOTE_PORT>>
 | 0xf3 | RSL_IE_IPAC_LOCAL_PORT | <<RSL_IE_IPAC_LOCAL_PORT>>
@@ -1085,6 +1086,25 @@
 | 8..255 | reserved values
 |===
 
+[[RSL_IE_OSMO_HR_GSM_RTP_FMT]]
+==== RSL_IE_OSMO_HR_GSM_RTP_FMT
+
+This one byte length TLV IE is used to select the RTP payload format for HR GSM during
+Channel Activation and Mode Modify.
+
+There are two different RTP payload formats defined for HR GSM (RFC 5993 and TS 101.318).
+On the receiving side (Downlink) osmoBTS will always accept both formats. The format
+used on the transmitting side (Uplink) depends on the BTS model unless it is explicitly
+specified using the RSL IE mentioned above.
+
+[options="header"]
+|===
+| *bit*            |  7  -  1    |  0
+| byte at offset 0 |  (reserved) |  0 = TS 101.318, 1 = RFC 5993
+|===
+
+(Bits 7 - 1 are reserved for future use and must be set to zero.)
+
 === A-bis RSL Initialization / BTS bring-up
 
 Upon receiving the 'IPA RSL CONNECT' OML message by the respective

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