16 Feb
2024
16 Feb
'24
4:49 p.m.
### Description
All kamailio versions on the 5.7.x train and additionally point release 5.6.5 break early
dialog transactions, at least when the following conditions are (cumulatively) met:
* topos-redis is enabled (haven't tested other storage backends yet, let me know if
needed)
* kamailio is multihomed
* enable_double_rr is enabled (the default)
### Troubleshooting
#### SIP Traffic
Here's an exchange demonstrating the problem:
```
kamailio instance
──────────┬──────────────────┬─────────
internal external peer
172.30.154.1:5060 185.73.43.241:5060 195.167.21.66:5060
──────────┬──────────────────┬───────── ──────────┬─────────
│ │ │
│ │ │
│ │ │
│ │ │
│ │ │
│ │ │
│ │ │
│ │ │
│ │ INVITE (SDP) │
│ │ ──────────────────────────> │
│ │ 100 Trying │
│ │ <────────────────────────── │
│ │ 183 Session Progress (SDP) │
│ │ <────────────────────────── │
│ │ PRACK │
│ │ ──────────────────────────> │
│ │ 200 OK │
│ │ <────────────────────────── │
│ │ UPDATE (SDP) │
UPDATE (SDP) │ │
<─────────────────────────── │ │
```
Whereas the expected behaviour should be:
```
│ │ UPDATE (SDP) │
| <────────────────────────── │
UPDATE (SDP)│ │ │
<───────── │ │ │
```
This is also exemplified by examining the Via headers as rewritten by kamailio.
Not working (>= 5.6.5, 5.7.x):
* Inbound Via: `Via: SIP/2.0/UDP
195.167.21.66:5060;branch=z9hG4bKtjlwcpvfh03epe0thhtjhq3qg;Role=3;Hpt=8e58_16`
* Oubound Via: `Via: SIP/2.0/UDP
185.73.43.241;branch=z9hG4bK66c4.3453dd9a219858819d528b9da671e39e.0`
Working (5.6.4):
* Inbound Via: `Via: SIP/2.0/UDP
195.167.21.66:5060;branch=z9hG4bK8lj1ahz6npz65khd8jkzl1ohh;Role=3;Hpt=8e68_16`
* Oubound Via: `Via: SIP/2.0/UDP
172.30.154.1;branch=z9hG4bK4dce.4f5448efd64465fa5dbaf5eef0dc35b7.0`
### Possible Solutions
Only solution I have found so far is to downgrade to kamailio 5.6.4
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### Additional Information
```
version: kamailio 5.7.4 (x86_64/linux)
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST,
DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, Q_MALLOC, F_MALLOC, TLSF_MALLOC,
DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER,
USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535,
DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown
compiled with gcc 10.2.1
```
But I have also tested all 5.7.x versions, which are all affected, as well 5.6.5.
* **Operating System**:
<!--
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CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `lsb_release -a` and `uname -a`)
-->
```
Linux host 5.10.0-27-amd64 #1 SMP Debian 5.10.205-2 (2023-12-31) x86_64 GNU/Linux
```
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