Fix "Transfer with consultation without Replaces" deadlock

This occurs when performing a consult transfer if the target does not
support the Replaces extension, due to the following path:

- refer() acquires a read lock over lines_mtx
- refer_consultation() is called
- A write lock over lines_mtx is acquired

Closes #118

1 files changed, 1 insertions, 1 deletions

diff --git a/src/phone.cpp b/src/phone.cpp
index c4e515f..401abb1 100644
--- a/src/phone.cpp
+++ b/src/phone.cpp
@@ -339,7 +339,7 @@ void t_phone::refer(const t_url &uri, const string &display) {
 
 void t_phone::refer(unsigned short lineno_from, unsigned short lineno_to) 
 {
-	t_rwmutex_reader x(lines_mtx);
+	t_rwmutex_future_writer x(lines_mtx);
 
 	// The nicest transfer is an attended transfer. An attended transfer
 	// is only possible of the transfer target supports the 'replaces'