Hello,

kamailio -v
version: kamailio 4.4.0-pre0 (i386/linux) f39d14-dirty
flags: STATS: Off, EXTRA_DEBUG, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, 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_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: f39d14 -dirty
compiled on 17:01:22 Feb 12 2016 with gcc 4.9.3

If I read well the RFC 3261 section 20.19 [https://tools.ietf.org/html/rfc3261#section-20.19] a SUBSCRIBE or a PUBLISH may have an Expires value of 2**32-1 = (4294967295).

But it appears to me that this value is not supported in Kamailio even if I allow it as a max_expires option in configuration (modparam("presence", "max_expires", 4294967295)).

Kamailio answers with the following:

2016/02/29 09:02:59.343750 192.168.100.1:5060 -> 192.168.2.2:5062
SIP/2.0 423 Interval Too Brief
via: SIP/2.0/UDP 192.168.2.2:5062;branch=z9hG4bK-11535-1-9;rport=5062
From: "User1" <sip:user1@example.com>;tag=11535-1
To: "User1" <sip:user1@example.com>;tag=dfba6eee28f067076993264b7e466d4e.151a
Call-ID: 1-11545@192.168.1.1-user1
CSeq: 3 PUBLISH
Expires: -2147483648
SIP-ETag: a.1456732971.11285.1.0
Server: kamailio (4.4.0-pre0 (i386/linux))
Content-Length: 0

Which is not compliant with the RFC, the Expires value should not be signed.

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